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Other apa guidelines: numbers, basics of numbers.

Per APA 7, Section 6.32, use numerals to express numbers 10 or above (e.g., 11, 23, 256). Per Section 6.33, write out numbers as words to express numbers up to nine (e.g., three, seven, eight).

Take the APA Style Diagnostic Quiz  to test your knowledge.

Numbers Expressed as Words

Use words to express numbers in these situations:

Seventeen computer programmers went out to dinner last night
The principal presented awards to three fourths of the student body.
(This is a new rule in APA 7. APA 6 recommended using numerals in the abstract.)

Numbers Expressed as Numerals

Use numerals to express numbers in these situations:

She had been a nurse for 3 years.
Chapter 4 was considered required reading.
The student scored a perfect 7.
Each post was roughly 2.45 ft apart.
Teachers gave students ice cream if they scored in the top 5%.
You owe me $5.

Numbers Video

  • APA Formatting & Style: Numbers (video transcript)

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apa number writing rules

APA Style: Writing & Citation

  • Voice and Tense
  • Clarity of Language

Basic Number Rule

Use numerals.

  • Avoiding Bias
  • Periods, Commas, and Semicolons
  • APA Citation Style This link opens in a new window

 APA style has special rules for expressing numbers within a research papers.  For more detailed information on numbers, please see pages 178-181 in the APA 7th edition manual.  When using numbers in APA, keep these two basic rules in mind.

• Use words instead of numerals when expressing numbers one through nine.

• Use numerals for numbers 10 and up.

Use words to express numbers in the following situations: (see page 179, Section 6.33 in the APA 7th edition manual)

When a number is the first word in a sentence, title, or heading.  Reword a sentence whenever possible to avoid using numbers at the beginning of a sentence.  

Twelve students completed the survey on depression.

Twenty percent of the sample showed an increase in stress levels.

Simple fractions 

One half of the participants.

a two-thirds majority

Use the"universally accepted usage" for certain proper nouns

                     The Twelve Apostles

The Twelfth Imam

Use numbers in the following situations: 

Numbers followed by a unit of measurement.

500 mg of acetaminophen

Statistical or mathematical functions, decimal fractions, proportions, percentages.

5 times as many

a ratio of 5:1

Numbers that represent scores, points on a scale, numerals as numerals, and any numbers in a figure or graph.

a score of 5 on a 7 point Likert scale

Numbers indicating a specific point in a numbered series.

When the noun comes before the number, the noun is usually capitalized.  If the number comes before the noun, the usual APA number rule still applys.  See examples below.

Use words for approximations of numbers of days, months, and years.  The manual does not dictate anything for approximations of weeks, decades, or centuries.  Use your own judgment when longer lengths of time.

Numerals and Words Together:

At times, numbers can end up back to back as modifiers to a noun.  An example, 10 7-point scale can easliy be misread as 107 point scale.  This would result in making your data confusing to the reader.  It is recommended that you use a combination of words and numbers to define your numbers.

ten 7-point scales

3 two-way interactions

twenty 6-year-olds

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  • Next: Avoiding Bias >>
  • Last Updated: Feb 7, 2024 1:36 PM
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How to write numbers in apa style, published by steve tippins on april 7, 2019 april 7, 2019.

Last Updated on: 30th August 2022, 04:41 am

APA style can be annoyingly precise with its requirements. But that’s exactly why style guides exist–to make up for the ambiguity of English grammar rules and offer a standard way to write. That’s why universities, newspapers, publishing houses, and academic journals all use style guides–to ensure that the material they produce all follows the same guidelines.

Writing numbers in APA style is fairly simple, but there are some exceptions to be aware of. All of the information below comes from the APA Publication Manual, 6th edition.

First, let’s look at the simple answer.

APA Numbers: The Simple Answer

The simplest thing to remember is, write out numbers below ten, and use numerals for numbers ten and greater.

For example,

“We interviewed three men and five women.”

“We surveyed 42 retail managers.”

However, there are some important exceptions to this rule. Below, I’ll detail the full requirements for APA numbers.

When to Write Out Numbers in APA Style

Beginning a sentence.

Always write out numbers that begin a sentence or a title. However, the APA style website recommends trying to re-word a sentence to avoid beginning with a number when possible.

“Thirty-five percent of the respondents said they had received little or no support from the program.”

“Thirteen of the participants received a placebo.”

Common Fractions

Always write out common fractions.

“While two-thirds of the participants said they found the program beneficial, the remainder of the participants said that they received little or no support.”

Ordinal Numbers

Write out ordinal numbers.

“By the time they reach twelfth grade, students should be adequately prepared for college.”

Universally Accepted Usage

Words that have a universally accepted usage as written out.

“The Twelve Apostles”

“The Five Pillars of Islam”

When to Use Numerals in APA Style

close-up shot of various numbers

Generally speaking, use numerals in all situations except the exceptions above. However, here are the situations the APA Publication Manual recommends.

Numbers 10 and Greater

Use numerals for numbers 10 and greater. For example,

“However, only 15 nurses filled out the questionnaire.”

“All of the companies lost over $8,000,000 as a result of the crash.”

Followed By Units of Measurement

Any number immediately followed by units of measurement should be written in numeral form.

“Participants each received a 3 mg dose.”

“Children less than 5 years old were not eligible to be participants in the study.”

“Participants received a second dose at 1:30 p.m.”

Scores, Scales, and Graphs

Use numerals for any numbers that represent scores, points on a scale, or any number in a figure or graph.

“A score of 6 on a 7-point Likert scale.”

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Representing Mathematical Functions

Statistical or mathematical functions, fractions, ratios, percentiles, and quartiles.

“…multiplied by 3”

“…the 5th percentile”

Numbers exact representing time, dates, ages. Approximations are represented by words (“about nine months ago”)

“2 hr 44 min”

Place in a Series

Use numerals for specific points in a series such as chapters or pages in a book “Page 5”

“Chapter 12”

“Module 7”

Use numerals to represent exact sums of money.

“3 dollars and 15 cents.”

Numbers Appearing Together

When numbers are used to modify other numbers, write out one of them. For example,

“Six 5-year-olds” (rather than 6 5-year-olds, which might be mistaken for “65-year-olds”)

In The Abstract

Always use numerals in the abstract, even for numbers below ten.

Other APA Number Rules to Be Aware Of

There are a few more rules to be aware of when writing numbers in APA style.

Decimal Fractions

Use a zero before the decimal point with numbers that are less than 1 (when the statistic can exceed 1).

Roman Numerals

If roman numerals are “part of an established terminology,” don’t change them to traditional (Arabic) numerals.

“Type II error”

Commas in Numbers

As a general rule, use commas as you normally would (“1,000,”). However, observe the following exceptions:

  • Page numbers
  • Binary digits
  • Serial numbers
  • Degrees of temperature
  • Acoustic frequency designations
  • Degrees of freedom

Plurals of Numbers

Add an “s” or “es” to numbers to pluralize them, whether they are numerals or written out. Do not add an apostrophe.

“Twos and threes”

Metric Units

When appropriate, make the full names of units plural, but do not pluralize abbreviations.

“Two meters,”

Do not place a period after a symbol

Use a space between the abbreviation or symbol and the number. The only exception is for the measures of angles.

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  • American Psychological Association. (2009). Publication manual of the American Psychological Association. (italics) Washington, D.C.: American Psychological Association.
  • https://www.apastyle.org/learn/faqs/numbers-as-words

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Home / Guides / Citation Guides / APA Format

APA Format for Students & Researchers

In this guide, students and researchers can learn the basics of creating a properly formatted research paper according to APA guidelines.

It includes information on how to conceptualize, outline, and format the basic structure of your paper, as well as practical tips on spelling, abbreviation, punctuation, and more. The guide concludes with a complete sample paper as well as a final checklist that writers can use to prepare their work for submission.

APA Paper Formatting Basics

  • All text should be double-spaced
  • Use one-inch margins on all sides
  • All paragraphs in the body are indented
  • Make sure that the title is centered on the page with your name and school/institution underneath
  • Use 12-point font throughout
  • All pages should be numbered in the upper right hand corner
  • The manual recommends using one space after most punctuation marks
  • A shortened version of the title (“running head”) should be placed in the upper left hand corner

Table of Contents

Here’s a quick rundown of the contents of this guide on how to do APA format.

Information related to writing and organizing your paper:

  • Paper and essay categories

General paper length

  • Margin sizes
  • Title pages
  • Running Heads
  • APA Outline
  • APA Abstract
  • The body of papers
  • APA headings and subheadings
  • Use of graphics (tables and figures)

Writing style tips:

Proper tone.

  • Reducing bias and labels
  • Abbreviation do’s and don’ts
  • Punctuation
  • Number rules

Citing Your Sources:

  • Citing Sources
  • In-text Citations
  • Reference Page

Proofing Your Paper:

  • Final checklist
  • Submitting your project

APA Information:

  • What is APA
  • APA 7 Updates

What you won’t find in this guide: This guide provides information related to the formatting of your paper, as in guidelines related to spacing, margins, word choice, etc. While it provides a general overview of APA references, it does not provide instructions for how to cite in APA format.

For step-by-step instructions for citing books, journals, how to cite a website in APA format, information on an APA format bibliography, and more, refer to these other EasyBib guides:

  • APA citation (general reference guide)
  • APA In-text citation
  • APA article citation
  • APA book citation
  • APA citation website

Or, you can use our automatic generator. Our APA formatter helps to build your references for you. Yep, you read that correctly.

Writing and Organizing Your APA Paper in an Effective Way

This section of our guide focuses on proper paper length, how to format headings, spacing, and more! This information can be found in Chapter 2 of the official manual (American Psychological Association, 2020, pp. 29-67).

Categories of papers

Before getting into the nitty-gritty details related to APA research paper format, first determine the type of paper you’re about to embark on creating:

Empirical studies

Empirical studies take data from observations and experiments to generate research reports. It is different from other types of studies in that it isn’t based on theories or ideas, but on actual data.

Literature reviews

These papers analyze another individual’s work or a group of works. The purpose is to gather information about a current issue or problem and to communicate where we are today. It sheds light on issues and attempts to fill those gaps with suggestions for future research and methods.

Theoretical articles

These papers are somewhat similar to a literature reviews in that the author collects, examines, and shares information about a current issue or problem, by using others’ research. It is different from literature reviews in that it attempts to explain or solve a problem by coming up with a new theory. This theory is justified with valid evidence.

Methodological articles

These articles showcase new advances, or modifications to an existing practice, in a scientific method or procedure. The author has data or documentation to prove that their new method, or improvement to a method, is valid. Plenty of evidence is included in this type of article. In addition, the author explains the current method being used in addition to their own findings, in order to allow the reader to understand and modify their own current practices.

Case studies

Case studies present information related an individual, group, or larger set of individuals. These subjects are analyzed for a specific reason and the author reports on the method and conclusions from their study. The author may also make suggestions for future research, create possible theories, and/or determine a solution to a problem.

Since APA style format is used often in science fields, the belief is “less is more.” Make sure you’re able to get your points across in a clear and brief way. Be direct, clear, and professional. Try not to add fluff and unnecessary details into your paper or writing.  This will keep the paper length shorter and more concise.

Margin sizes in APA Format

When it comes to margins, keep them consistent across the left, right, top, and bottom of the page. All four sides should be the same distance from the edge of the paper. It’s recommended to use at least one-inch margins around each side. It’s acceptable to use larger margins, but the margins should never be smaller than an inch.

Title pages in APA Format

The title page, or APA format cover page, is the first page of a paper or essay. Some teachers and professors do not require a title page, but some do. If you’re not sure if you should include one or not, ask your teacher. Some appreciate the page, which clearly displays the writer’s name and the title of the paper.

The APA format title page for student papers includes six main components:

  • the title of the APA format paper
  • names of all authors
  • institutional affiliation
  • course number and title
  • instructor’s name

Title pages for professional papers  also require a running head; student papers do not.

Some instructors and professional publications also ask for an author’s note. If you’re required or would like to include an author’s note, place it below the institutional affiliation. Examples of information included in an author’s note include an ORCID iD number, a disclosure, and an acknowledgement.

Here are key guidelines to developing your title page:

  • The title of the paper should capture the main idea of the essay, but should not contain abbreviations or words that serve no purpose. For example, instead of using the title “A Look at Amphibians From the Past,” title the paper “Amphibians From the Past.” Delete the unnecessary fluff!
  • Center the title on the page and place it about 3-4 lines from the top.
  • The title should be bolded, in title case, and the same font size as your other page text. Do not underline or italicize the title. Other text on the page should be plain (not bolded , underlined, or italicized ). 
  • All text on the title page should be double-spaced. The APA format examples paper below displays proper spacing, so go take a look!
  • Do not include any titles in the author’s name such as Dr. or Ms. In contrast, for your instructor’s name, use the form they prefer (e.g., Sagar Parekh, PhD; Dr. Minako Asato; Professor Nathan Ian Brown; etc.).
  • The institutional affiliation is the school the author attends or the location where the author conducted the research.

In a hurry? Try the  EasyBib title page maker to easily create a title page for free.

apa number writing rules

Sample of an APA format title page for a student paper:

APA-format-student-title-page

Sample of title page for a professional paper:

APA-format-professional-title-page

Running heads in APA Format

The 7th edition of the American Psychological Association Publication Manual (p. 37) states that running heads are not required for student papers unless requested by the instructor. Student papers still need a page number included in the upper right-hand corner of every page. The 6th edition required a running head for student papers, so be sure to confirm with your instructor which edition you should follow. Of note, this guide follows the 7th edition.

Running heads are required for professional papers (e.g., manuscripts submitted for publication). Read on for instructions on how to create them.

Are you wondering what is a “running head”? It’s basically a page header at the top of every page. To make this process easier, set your word processor to automatically add these components onto each page. You may want to look for “Header” in the features.

A running head/page header includes two pieces:

  • the title of the paper
  • page numbers.

Insert page numbers justified to the right-hand side of the APA format paper (do not put p. or pg. in front of the page numbers).

For all pages of the paper, including the APA format title page, include the “TITLE OF YOUR PAPER” justified to the left in capital letters (i.e., the running head). If your full title is long (over 50 characters), the running head title should be a shortened version.

APA format running head

Preparing outlines in APA Format

Outlines are extremely beneficial as they help writers stay organized, determine the scope of the research that needs to be included, and establish headings and subheadings.

There isn’t an official or recommended “APA format for outline” structure. It is up to the writer (if they choose to make use of an outline) to determine how to organize it and the characters to include. Some writers use a mix of roman numerals, numbers, and uppercase and lowercase letters.

Even though there isn’t a required or recommended APA format for an outline, we encourage writers to make use of one. Who wouldn’t want to put together a rough outline of their project? We promise you, an outline will help you stay on track.

Here’s our version of how APA format for outlines could look:

apa number writing rules

Don’t forget, if you’re looking for information on APA citation format and other related topics, check out our other comprehensive guides.

How to form an abstract in APA

An APA format abstract (p. 38) is a summary of a scholarly article or scientific study. Scholarly articles and studies are rather lengthy documents, and abstracts allow readers to first determine if they’d like to read an article in its entirety or not.

You may come across abstracts while researching a topic. Many databases display abstracts in the search results and often display them before showing the full text of an article or scientific study. It is important to create a high quality abstract that accurately communicates the purpose and goal of your paper, as readers will determine if it is worthy to continue reading or not.

Are you wondering if you need to create an abstract for your assignment? Usually, student papers do not require an abstract. Abstracts are not typically seen in class assignments, and are usually only included when submitting a paper for publication. Unless your teacher or professor asked for it, you probably don’t need to have one for your class assignment.

If you’re planning on submitting your paper to a journal for publication, first check the journal’s website to learn about abstract and APA paper format requirements.

Here are some helpful suggestions to create a dynamic abstract:

  • Abstracts are found on their own page, directly after the title or cover page.
  • Professional papers only (not student papers): Include the running head on the top of the page.
  • On the first line of the page, center the word “Abstract” (but do not include quotation marks).
  • On the following line, write a summary of the key points of your research. Your abstract summary is a way to introduce readers to your research topic, the questions that will be answered, the process you took, and any findings or conclusions you drew. Use concise, brief, informative language. You only have a few sentences to share the summary of your entire document, so be direct with your wording.
  • This summary should not be indented, but should be double-spaced and less than 250 words.
  • If applicable, help researchers find your work in databases by listing keywords from your paper after your summary. To do this, indent and type Keywords : in italics.  Then list your keywords that stand out in your research. You can also include keyword strings that you think readers will type into the search box.
  • Active voice: The subjects reacted to the medication.
  • Passive voice: There was a reaction from the subjects taking the medication.
  • Instead of evaluating your project in the abstract, simply report what it contains.
  • If a large portion of your work includes the extension of someone else’s research, share this in the abstract and include the author’s last name and the year their work was released.

APA format example page:

Example APA abstract

Here’s an example of an abstract:

Visual design is a critical aspect of any web page or user interface, and its impact on a user’s experience has been studied extensively. Research has shown a positive correlation between a user’s perceived usability and a user’s assessment of visual design. Additionally, perceived web quality, which encompasses visual design, has a positive relationship with both initial and continued consumer purchase intention. However, visual design is often assessed using self-report scale, which are vulnerable to a few pitfalls. Because self-report questionnaires are often reliant on introspection and honesty, it is difficult to confidently rely on self-report questionnaires to make important decisions. This study aims to ensure the validity of a visual design assessment instrument (Visual Aesthetics of Websites Inventory: Short version) by examining its relationship with biometric (variables), like galvanic skin response, pupillometry, and fixation information. Our study looked at participants assessment of a webpage’s visual design, and compared it to their biometric responses while viewing the webpage. Overall, we found that both average fixation duration and pupil dilation differed when participants viewed web pages with lower visual design ratings compared to web pages with a higher visual design rating.

Keywords : usability, visual design, websites, eye tracking, pupillometry, self-report, VisAWI

The body of an APA paper

On the page after the title page (if a student paper) or the abstract (if a professional paper), begin with the body of the paper.

Most papers follow this format:

  • At the top of the page, add the page number in the upper right corner of all pages, including the title page.
  • On the next line write the title in bold font and center it. Do not underline or italicize it.
  • Begin with the introduction and indent the first line of the paragraph. All paragraphs in the body are indented.

Sample body for a student paper:

example APA paper body

Most scientific or professional papers have additional sections and guidelines:

  • Start with the running head (title + page number). The heading title should be in capital letters. The abstract page should be page 2.
  • The introduction presents the problem and premise upon which the research was based. It goes into more detail about this problem than the abstract.
  • Begin a new section with the Method and use this word as the subtitle. Bold and center this subtitle. The Method section shows how the study was run and conducted. Be sure to describe the methods through which data was collected.
  • Begin a new section with the Results . Bold and center this subtitle. The Results section summarizes your data. Use charts and graphs to display this data.
  • Draw conclusions and support how your data led to these conclusions.
  • Discuss whether or not your hypothesis was confirmed or not supported by your results.
  • Determine the limitations of the study and next steps to improve research for future studies.

Sample body for a professional paper:

example apa format professional paper body

Keep in mind, APA citation format is much easier than you think, thanks to EasyBib.com. Try our automatic generator and watch how we create APA citation format references for you in just a few clicks. While you’re at it, take a peek at our other helpful guides, such as our APA reference page guide, to make sure you’re on track with your research papers.

Proper usage of headings & subheadings in APA Format

Headings (p. 47) serve an important purpose in research papers — they organize your paper and make it simple to locate different pieces of information. In addition, headings provide readers with a glimpse to the main idea, or content, they are about to read.

In APA format, there are five levels of headings, each with a different formatting:

  • This is the title of your paper
  • The title should be centered in the middle of the page
  • The title should be bolded
  • Use uppercase and lowercase letters where necessary (called title capitalization)
  • Place this heading against the left margin
  • Use bold letters
  • Use uppercase and lowercase letters where necessary
  • Place this heading against the left side margin
  • End the heading with a period
  • Indented in from the left margin

Following general formatting rules, all headings are double spaced and there are no extra lines or spaces between sections.

Here is a visual APA format template for levels of headings:

example apa format headings

Use of graphics (tables and figures) in APA Format

If you’re looking to jazz up your project with any charts, tables, drawings, or images, there are certain APA format rules (pp. 195-250) to follow.

First and foremost, the only reason why any graphics should be added is to provide the reader with an easier way to see or read information, rather than typing it all out in the text.

Lots of numbers to discuss? Try organizing your information into a chart or table. Pie charts, bar graphs, coordinate planes, and line graphs are just a few ways to show numerical data, relationships between numbers, and many other types of information.

Instead of typing out long, drawn out descriptions, create a drawing or image. Many visual learners would appreciate the ability to look at an image to make sense of information.

Before you go ahead and place that graphic in your paper, here are a few key guidelines:

  • Follow them in the appropriate numerical order in which they appear in the text of your paper. Example : Figure 1, Figure 2, Table 1, Figure 3.
  • Example: Figure 1, Figure 2, Table 1, Figure 3
  • Only use graphics if they will supplement the material in your text. If they reinstate what you already have in your text, then it is not necessary to include a graphic.
  • Include enough wording in the graphic so that the reader is able to understand its meaning, even if it is isolated from the corresponding text. However, do not go overboard with adding a ton of wording in your graphic.
  • Left align tables and figures

In our APA format sample paper , you’ll find examples of tables after the references. You may also place tables and figures within the text just after it is mentioned.

Is there anything better than seeing a neatly organized data table? We think not! If you have tons of numbers or data to share, consider creating a table instead of typing out a wordy paragraph. Tables are pretty easy to whip up on Google Docs or Microsoft Word.

General format of a table should be:

  • Table number
  • Choose to type out your data OR create a table. As stated above, in APA format, you shouldn’t have the information typed out in your paper and also have a table showing the same exact information. Choose one or the other.
  • If you choose to create a table, discuss it very briefly in the text. Say something along the lines of, “Table 1 displays the amount of money used towards fighting Malaria.” Or, “Stomach cancer rates are displayed in Table 4.”
  • If you’re submitting your project for a class, place your table close to the text where it’s mentioned. If you’re submitting it to be published in a journal, most publishers prefer tables to be placed in the back. If you’re unsure where to place your tables, ask!
  • Include the table number first and at the top. Table 1 is the first table discussed in the paper. Table 2 is the next table mentioned, and so on. This should be in bold.
  • Add a title under the number. Create a brief, descriptive title. Capitalize the first letter for each important word. Italicize the title and place it under the table number.
  • Only use horizontal lines.
  • Limit use of cell shading.
  • Keep the font at 12-point size and use single or double spacing. If you use single spacing in one table, make sure all of the others use single spaces as well. Keep it consistent.
  • All headings should be centered.
  • In the first column (called the stub), center the heading, left-align the information underneath it (indent 0.15 inches if info is more than one line).
  • Information in other columns should be centered.
  • General . Information about the whole table.
  • Specific . Information targeted for a specific column, row, or cell.
  • Probability . Explains what certain table symbols mean. For example, asterisks,  p values, etc.

Here’s an APA format example of a table:

example apa format table

We know putting together a table is pretty tricky. That’s why we’ve included not one, but a few tables on this page. Scroll down and look at the additional tables in the essay in APA format example found below.

Figures represent information in a visual way. They differ from tables in that they are visually appealing. Sure, tables, like the one above, can be visually appealing, but it’s the color, circles, arrows, boxes, or icons included that make a figure a “figure.”

There are many commonly used figures in papers. Examples APA Format:

  • Photographs
  • Hierarchy charts

General format of a figure is the same as tables. This means each should include:

  • Figure number

Use the same formatting tables use for the number, title, and note.

Here are some pointers to keep in mind when it comes to APA format for figures:

  • Only include a figure if it adds value to your paper. If it will truly help with understanding, include it!
  • Either include a figure OR write it all out in the text. Do not include the same information twice.
  • If a note is added, it should clearly explain the content of the figure. Include any reference information if it’s reproduced or adapted.

APA format sample of a figure:

example apa format figure

Photographs:

We live in a world where we have tons of photographs available at our fingertips.

Photographs found through Google Images, social media, stock photos made available from subscription sites, and tons of other various online sources make obtaining photographs a breeze. We can even pull out our cell phones, and in just a few seconds, take pictures with our cameras.

Photographs are simple to find, and because of this, many students enjoy using them in their papers.

If you have a photograph you would like to include in your project, here are some guidelines from the American Psychological Association.

  • Create a reference for the photograph. Follow the guidelines under the table and figure sections above.
  • Do not use color photos. It is recommended to use black and white. Colors can change depending on the reader’s screen resolution. Using black and white ensures the reader will be able to view the image clearly. The only time it is recommended to use color photos is if you’re writing about color-specific things. For example, if you’re discussing the various shades of leaf coloration, you may want to include a few photographs of colorful leaves.
  • If there are sections of the photograph that are not related to your work, it is acceptable to crop them out. Cropping is also beneficial in that it helps the reader focus on the main item you’re discussing.
  • If you choose to include an image of a person you know, it would be respectful if you ask their permission before automatically including their photo in your paper.  Some schools and universities post research papers online and some people prefer that their photos and information stay off the Internet.

B. Writing Style Tips

Writing a paper for scientific topics is much different than writing for English, literature, and other composition classes. Science papers are much more direct, clear, and concise. This section includes key suggestions, explains how to write in APA format, and includes other tidbits to keep in mind while formulating your research paper.

Verb usage in APA

Research experiments and observations rely on the creation and analysis of data to test hypotheses and come to conclusions. While sharing and explaining the methods and results of studies, science writers often use verbs.

When using verbs in writing, make sure that you continue to use them in the same tense throughout the section you’re writing. Further details are in the publication manual (p. 117).

Here’s an APA format example:

We tested the solution to identify the possible contaminants.

It wouldn’t make sense to add this sentence after the one above:

We tested the solution to identify the possible contaminants. Researchers often test solutions by placing them under a microscope.

Notice that the first sentence is in the past tense while the second sentence is in the present tense. This can be confusing for readers.

For verbs in scientific papers, the APA manual recommends using:

  • Past tense or present perfect tense for the explantation of the procedure
  • Past tense for the explanation of the results
  • Present tense for the explanation of the conclusion and future implications

If this is all a bit much, and you’re simply looking for help with your references, try the EasyBib.com APA format generator . Our APA formatter creates your references in just a few clicks. APA citation format is easier than you think thanks to our innovative, automatic tool.

Even though your writing will not have the same fluff and detail as other forms of writing, it should not be boring or dull to read. The Publication Manual suggests thinking about who will be the main reader of your work and to write in a way that educates them.

How to reduce bias & labels

The American Psychological Association strongly objects to any bias towards gender, racial groups, ages of individuals or subjects, disabilities, and sexual orientation (pp. 131-149). If you’re unsure whether your writing is free of bias and labels or not, have a few individuals read your work to determine if it’s acceptable.

Here are a few guidelines that the American Psychological Association suggests :

  • Only include information about an individual’s orientation or characteristic if it is important to the topic or study. Do not include information about individuals or labels if it is not necessary.
  • If writing about an individual’s characteristic or orientation, for essay APA format, make sure to put the person first. Instead of saying, “Diabetic patients,” say, “Patients who are diabetic.”
  • Instead of using narrow terms such as, “adolescents,” or “the elderly,” try to use broader terms such as, “participants,” and “subjects.”
  • “They” or “their” are acceptable gender-neutral pronouns to use.
  • Be mindful when using terms that end with “man” or “men” if they involve subjects who are female. For example, instead of using “Firemen,” use the term, “Firefighter.” In general, avoid ambiguity.
  • When referring to someone’s racial or ethnic identity, use the census category terms and capitalize the first letter. Also, avoid using the word, “minority,” as it can be interpreted as meaning less than or deficient. Instead, say “people of color” or “underrepresented groups.”
  • When describing subjects in APA format, use the words “girls” and “boys” for children who are under the age of 12. The terms, “young woman,” “young man,” “female adolescent,” and “male adolescent” are appropriate for subjects between 13-17 years old; “Men,” and “women,” for those older than 18. Use the term, “older adults.” for individuals who are older. “Elderly,” and “senior,” are not acceptable if used only as nouns. It is acceptable to use these terms if they’re used as adjectives.

Read through our example essay in APA format, found in section D, to see how we’ve reduced bias and labels.

Spelling in APA Format

  • In APA formatting, use the same spelling as words found in Merriam-Webster’s Collegiate Dictionary (American English) (p. 161).
  • If the word you’re trying to spell is not found in Webster’s Collegiate Dictionary, a second resource is Webster’s Third New International Dictionary .
  • If attempting to properly spell words in the psychology field, consult the American Psychological Association’s Dictionary of Psychology

Thanks to helpful tools and features, such as the spell checker, in word processing programs, most of us think we have everything we need right in our document. However, quite a few helpful features are found elsewhere.

Where can you find a full grammar editor? Right here, on EasyBib.com. The EasyBib Plus paper checker scans your paper for spelling, but also for any conjunction , determiner, or adverb out of place. Try it out and unlock the magic of an edited paper.

Abbreviation do’s and don’ts in APA Format

Abbreviations can be tricky. You may be asking yourself, “Do I include periods between the letters?” “Are all letters capitalized?” “Do I need to write out the full name each and every time?” Not to worry, we’re breaking down the publication manual’s abbreviations (p. 172) for you here.

First and foremost, use abbreviations sparingly.

Too many and you’re left with a paper littered with capital letters mashed together. Plus, they don’t lend themselves to smooth and easy reading. Readers need to pause and comprehend the meaning of abbreviations and quite often stumble over them.

  • If the abbreviation is used less than three times in the paper, type it out each time. It would be pretty difficult to remember what an abbreviation or acronym stands for if you’re writing a lengthy paper.
  • If you decide to sprinkle in abbreviations,  it is not necessary to include periods between the letters.
  • Example: While it may not affect a patient’s short-term memory (STM), it may affect their ability to comprehend new terms. Patients who experience STM loss while using the medication should discuss it with their doctor.
  • Example : AIDS
  • The weight in pounds exceeded what we previously thought.

Punctuation in APA Format

One space after most punctuation marks.

The manual recommends using one space after most punctuation marks, including punctuation at the end of a sentence (p. 154). It doesn’t hurt to double check with your teacher or professor to ask their preference since this rule was changed recently (in 2020).

The official APA format book was primarily created to aid individuals with submitting their paper for publication in a professional journal. Many schools adopt certain parts of the handbook and modify sections to match their preference. To see an example of an APA format research paper, with the spacing we believe is most commonly and acceptable to use, scroll down and see section D.

For more information related to the handbook, including frequently asked questions, and more, here’s further reading on the style

It’s often a heated debate among writers whether or not to use an Oxford comma (p. 155), but for this style, always use an Oxford comma. This type of comma is placed before the words AND and OR or in a series of three items.

Example of APA format for commas: The medication caused drowsiness, upset stomach, and fatigue.

Here’s another example: The subjects chose between cold, room temperature, or warm water.

Apostrophes

When writing a possessive singular noun, you should place the apostrophe before the s. For possessive plural nouns, the apostrophe is placed after the s.

  • Singular : Linda Morris’s jacket
  • Plural : The Morris’ house

Em dashes (long dash) are used to bring focus to a particular point or an aside. There are no spaces after these dashes (p. 157).

Use en dashes (short dash) in compound adjectives. Do not place a space before or after the dash. Here are a few examples:

  • custom-built
  • 12-year-old

Number rules in APA Format

Science papers often include the use of numbers, usually displayed in data, tables, and experiment information. The golden rule to keep in mind is that numbers less than 10 are written out in text. If the number is more than 10, use numerals.

APA format examples:

  • 14 kilograms
  • seven individuals
  • 83 years old
  • Fourth grade

The golden rule for numbers has exceptions.

In APA formatting, use numerals if you are:

  • Showing numbers in a table or graph
  • 4 divided by 2
  • 6-month-olds

Use numbers written out as words if you are:

  • Ninety-two percent of teachers feel as though….
  • Hundred Years’ War
  • One-sixth of the students

Other APA formatting number rules to keep in mind:

  • World War II
  • Super Bowl LII
  • It’s 1980s, not 1980’s!

Additional number rules can be found in the publication manual (p. 178)

Need help with other writing topics? Our plagiarism checker is a great resource for anyone looking for writing help. Say goodbye to an out of place noun , preposition , or adjective, and hello to a fully edited paper.

Overview of APA references

While writing a research paper, it is always important to give credit and cite your sources; this lets you acknowledge others’ ideas and research you’ve used in your own work. Not doing so can be considered plagiarism , possibly leading to a failed grade or loss of a job.

APA style is one of the most commonly used citation styles used to prevent plagiarism. Here’s more on crediting sources . Let’s get this statement out of the way before you become confused: An APA format reference and an APA format citation are two different things! We understand that many teachers and professors use the terms as if they’re synonyms, but according to this specific style, they are two separate things, with different purposes, and styled differently.

A reference displays all of the information about the source — the title, the author’s name, the year it was published, the URL, all of it! References are placed on the final page of a research project.

Here’s an example of a reference:

Wynne-Jones, T. (2015). The emperor of any place . Candlewick Press.

An APA format citation is an APA format in-text citation. These are found within your paper, anytime a quote or paraphrase is included. They usually only include the name of the author and the date the source was published.

Here’s an example of one:

Hypertrophic cardiomyopathy is even discussed in the book, The Emperor of Any Place . The main character, Evan, finds a mysterious diary on his father’s desk (the same desk his father died on, after suffering from a hypertrophic cardiomyopathy attack). Evan unlocks the truth to his father and grandfather’s past (Wynne-Jones, 2015).

Both of the ways to credit another individual’s work — in the text of a paper and also on the final page — are key to preventing plagiarism. A writer must use both types in a paper. If you cite something in the text, it must have a full reference on the final page of the project. Where there is one, there must be the other!

Now that you understand that, here’s some basic info regarding APA format references (pp. 281-309).

  • Each reference is organized, or structured, differently. It all depends on the source type. A book reference is structured one way, an APA journal is structured a different way, a newspaper article is another way. Yes, it’s probably frustrating that not all references are created equal and set up the same way. MLA works cited pages are unique in that every source type is formatted the same way. Unfortunately, this style is quite different.
  • Most references follow this general format:

Author’s Last name, First initial. Middle initial. (Year published). Title of source . URL.

Again, as stated in the above paragraph, you must look up the specific source type you’re using to find out the placement of the title, author’s name, year published, etc.

For more information on APA format for sources and how to reference specific types of sources, use the other guides on EasyBib.com. Here’s another useful site .

Looking for a full visual of a page of references? Scroll down and take a peek at our APA format essay example towards the bottom of this page. You’ll see a list of references and you can gain a sense of how they look.

Bonus: here’s a link to more about the fundamentals related to this particular style. If you want to brush up or catch up on the Modern Language Association’s style, here’s a great resource on how to cite websites in MLA .

In-text APA citation format

Did you find the perfect quote or piece of information to include in your project? Way to go! It’s always a nice feeling when we find that magical piece of data or info to include in our writing. You probably already know that you can’t just copy and paste it into your project, or type it in, without also providing credit to the original author.

Displaying where the original information came from is much easier than you think.Directly next to the quote or information you included, place the author’s name and the year nearby. This allows the reader of your work to see where the information originated.

APA allows for the use of two different forms of in-text citation, parenthetical and narrative Both forms of citation require two elements:

  • author’s name
  • year of publication

The only difference is the way that this information is presented to the reader.

Parenthetical citations are the more commonly seen form of in-text citations for academic work, in which both required reference elements are presented at the end of the sentence in parentheses. Example:

Harlem had many artists and musicians in the late 1920s (Belafonte, 2008).

Narrative citations allow the author to present one or both of the required reference elements inside of the running sentence, which prevents the text from being too repetitive or burdensome. When only one of the two reference elements is included in the sentence, the other is provided parenthetically. Example:

According to Belafonte (2008), Harlem was full of artists and musicians in the late 1920s.

If there are two authors listed in the source entry, then the parenthetical reference must list them both:

(Smith & Belafonte, 2008)

If there are three or more authors listed in the source entry, then the parenthetical reference can abbreviate with “et al.”, the latin abbreviation for “and others”:

(Smith et al., 2008)

The author’s names are structured differently if there is more than one author. Things will also look different if there isn’t an author at all (which is sometimes the case with website pages). For more information on APA citation format, check out this page on the topic: APA parenthetical citation and APA in-text citation . There is also more information in the official manual in chapter 8.

If it’s MLA in-text and parenthetical citations you’re looking for, we’ve got your covered there too! You might want to also check out his guide on parenthetical citing .

Would you benefit from having a tool that helps you easily generate citations that are in the text? Check out EasyBib Plus!

apa number writing rules

References page in APA Format

An APA format reference page is easier to create than you probably think. We go into detail on how to create this page on our APA reference page . We also have a guide for how to create an annotated bibliography in APA . But, if you’re simply looking for a brief overview of the reference page, we’ve got you covered here.

Here are some pointers to keep in mind when it comes to the references page in APA format:

  • This VIP page has its very own page. Start on a fresh, clean document (p. 303).
  • Center and bold the title “References” (do not include quotation marks, underline, or italicize this title).
  • Alphabetize and double-space ALL entries.
  • Use a readable font, such as Times New Roman, Arial, Calibri, or Lucida (p. 44).
  • Every quote or piece of outside information included in the paper should be referenced and have an entry.
  • Even though it’s called a “reference page,” it can be longer than one page. If your references flow onto the next page, then that’s a-okay.
  • Only include the running head if it is required by your teacher or you’re writing a professional paper.

Sample reference page for a student paper:

Here’s another friendly reminder to use the EasyBib APA format generator (that comes with EasyBib Plus) to quickly and easily develop every single one of your references for you. Try it out! Our APA formatter is easy to use and ready to use 24/7.

Final APA Format Checklist

Prior to submitting your paper, check to make sure you have everything you need and everything in its place:

  • Did you credit all of the information and quotes you used in the body of your paper and show a matching full reference at the end of the paper? Remember, you need both! Need more information on how to credit other authors and sources? Check out our other guides, or use the EasyBib APA format generator to credit your sources quickly and easily. EasyBib.com also has more styles than just the one this page focuses on.
  • 12-pt. Times New Roman
  • 11-pt. Calibri, Arial, Georgia
  • 10-pt. Lucida, Sans Unicode, Computer Modern
  • If you created an abstract, is it directly after the title page? Some teachers and professors do not require an abstract, so before you go ahead and include it, make sure it’s something he or she is expecting.
  • Professional paper — Did you include a running head on every single page of your project?
  • Student paper — Did you include page numbers in the upper right-hand corner of all your pages?
  • Are all headings, as in section or chapter titles, properly formatted? If you’re not sure, check section number 9.
  • Are all tables and figures aligned properly? Did you include notes and other important information directly below the table or figure? Include any information that will help the reader completely understand everything in the table or figure if it were to stand alone.
  • Are abbreviations used sparingly? Did you format them properly?
  • Is the entire document double spaced?
  • Are all numbers formatted properly? Check section 17, which is APA writing format for numbers.
  • Did you glance at the sample paper? Is your assignment structured similarly? Are all of the margins uniform?

Submitting Your APA Paper

Congratulations for making it this far! You’ve put a lot of effort into writing your paper and making sure the t’s are crossed and the i’s are dotted. If you’re planning to submit your paper for a school assignment, make sure you review your teacher or professor’s procedures.

If you’re submitting your paper to a journal, you probably need to include a cover letter.

Most cover letters ask you to include:

  • The author’s contact information.
  • A statement to the editor that the paper is original.
  • If a similar paper exists elsewhere, notify the editor in the cover letter.

Once again, review the specific journal’s website for exact specifications for submission.

Okay, so you’re probably thinking you’re ready to hit send or print and submit your assignment. Can we offer one last suggestion? We promise it will only take a minute.

Consider running your paper through our handy dandy paper checker. It’s pretty simple.

Copy and paste or upload your paper into our checker. Within a minute, we’ll provide feedback on your spelling and grammar. If there’s a pronoun , interjection , or verb out of place, we’ll highlight it and offer suggestions for improvement. We’ll even take it a step further and point out any instances of possible plagiarism.

If it sounds too good to be true, then head on over to our innovative tool and give it a whirl. We promise you won’t be disappointed.

What is APA Format?

APA stands for the American Psychological Association . In this guide, you’ll find information related to “What is APA format?” in relation to writing and organizing your paper according to the American Psychological Association’s standards. Information on how to cite sources can be found on our APA citation page. The official American Psychological Association handbook was used as a reference for our guide and we’ve included page numbers from the manual throughout. However, this page is not associated with the association.

You’ll most likely use APA format if your paper is on a scientific topic. Many behavioral and social sciences use this organization’s standards and guidelines.

What are behavioral sciences? Behavioral sciences study human and animal behavior. They can include:

  • Cognitive Science
  • Neuroscience

What are social sciences? Social sciences focus on one specific aspect of human behavior, specifically social and cultural relationships. Social sciences can include:

  • Anthropology
  • Political Science
  • Human Geography
  • Archaeology
  • Linguistics

What’s New in the 7th Edition?

This citation style was created by the American Psychological Association. Its rules and guidelines can be found in the Publication Manual of the American Psychological Association . The information provided in the guide above follows the 6th edition (2009) of the manual. The 7th edition was published in 2020 and is the most recent version.

The 7th edition of the Publication Manual is in full color and includes 12 sections (compared to 8 sections in the 6th edition). In general, this new edition differentiates between professional and student papers, includes guidance with accessibility in mind, provides new examples to follow, and has updated guidelines.We’ve selected a few notable updates below, but for a full view of all of the 7th edition changes visit the style’s website linked here .

  • Paper title
  • Student name
  • Affiliation (e.g., school, department, etc.)
  • Course number and title
  • Course instructor
  • 6th edition – Running head: SMARTPHONE EFFECTS ON ADOLESCENT SOCIALIZATION
  • 7th edition – SMARTPHONE EFFECTS ON ADOLESCENT SOCIALIZATION
  • Pronouns . “They” can be used as a gender-neutral pronoun.
  • Bias-free language guidelines . There are updated and new sections on guidelines for this section. New sections address participation in research, socioeconomic status, and intersectionality.
  • Spacing after sentences. Add only a single space after end punctuation.
  • Tables and figures . The citing format is now streamlined so that both tables and figures should include a name and number above the table/figure, and a note underneath the table/figure.
  • 6th ed. – (Ikemoto, Richardson, Murphy, Yoshida 2016)
  • 7th ed. – (Ikemoto et al., 2016)
  • Citing books. The location of the publisher can be omitted. Also, e-books no longer need to mention the format (e.g., Kindle, etc.)
  • Example: https://doi.org/10.1038/s42255-019-0153-5
  • Using URLs. URLs no longer need to be prefaced by the words “Retrieved from.”

New citing information . There is new guidance on citing classroom or intranet resources, and oral traditions or traditional knowledge of indigenous peoples.

Visit our EasyBib Twitter feed to discover more citing tips, fun grammar facts, and the latest product updates.

American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.) (2020). American Psychological Association. https://doi.org/10.1037/0000165-000

apa format

Published October 31, 2011. Updated May 14, 2020.

Written and edited by Michele Kirschenbaum and Elise Barbeau. Michele Kirschenbaum is a school library media specialist and the in-house librarian at EasyBib.com. Elise Barbeau is the Citation Specialist at Chegg. She has worked in digital marketing, libraries, and publishing.

APA Formatting Guide

APA Formatting

  • Annotated Bibliography
  • Block Quotes
  • et al Usage
  • Multiple Authors
  • Paraphrasing
  • Page Numbers
  • Parenthetical Citations
  • Sample Paper
  • View APA Guide

Citation Examples

  • Book Chapter
  • Journal Article
  • Magazine Article
  • Newspaper Article
  • Website (no author)
  • View all APA Examples

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We should not use “et al.” in APA reference list entries. If the number of authors in the source is up to and including 20, list all author names and use an ampersand (&) before the final author’s name. If the number of authors is more than 20, list the first 19 authors’ names followed by an ellipsis (but no ampersand), and then add the final author’s name. An example of author names in a reference entry having more than 20 authors is given below:

Author Surname1, F. M., Author Surname2, F. M., Author Surname3, F. M., Author Surname4, F. M., Author Surname5, F. M., Author Surname6, F. M., Author Surname7, F. M., Author Surname8, F. M., Author Surname9, F. M., Author Surname10, F. M., Author Surname11, F. M., Author Surname12, F. M., Author Surname13, F. M., Author Surname14, F. M., Author Surname15, F. M., Author Surname16, F. M., Author Surname17, F. M., Author Surname18, F. M., Author Surname19, F. M., . . .  Last Author Surname, F. M. (Publication Year).

Alvarez, L. D., Peach, J. L., Rodriguez, J. F., Donald, L., Thomas, M., Aruck, A., Samy, K., Anthony, K., Ajey, M., Rodriguez, K. L., Katherine, K., Vincent, A., Pater, F., Somu, P., Pander, L., Berd, R., Fox, L., Anders, A., Kamala, W., . . . Nicole Jones, K. (2019).

Note that, unlike references with 2 to 20 author names, the symbol “&” is not used here before the last author’s name.

APA 7, released in October 2019, has some new updates. Here is a brief description of the updates made in APA 7.

Different types of papers and best practices are given in detail in Chapter 1.

How to format a student title page is explained in Chapter 2. Examples of a professional paper and a student paper are included.

Chapter 3 provides additional information on qualitative and mixed methods of research.

An update on writing style is included in Chapter 4.

In chapter 5, some best practices for writing with bias-free language are included.

Chapter 6 gives some updates on style elements including using a single space after a period, including a citation with an abbreviation, the treatment of numbers in abstracts, treatment for different types of lists, and the formatting of gene and protein names.

In Chapter 7, additional examples are given for tables and figures for different types of publications.

In Chapter 8, how to format quotations and how to paraphrase text are covered with additional examples. A simplified version of in-text citations is clearly illustrated.

Chapter 9 has many updates: listing all author names up to 20 authors, standardizing DOIs and URLs, and the formatting of an annotated bibliography.

Chapter 10 includes many examples with templates for all reference types. New rules covering the inclusion of the issue number for journals and the omission of publisher location from book references are provided. Explanations of how to cite YouTube videos, power point slides, and TED talks are included.

Chapter 11 includes many legal references for easy understanding.

Chapter 12 provides advice for authors on how to promote their papers.

For more information on some of the changes found in APA 7, check out this EasyBib article .

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How to Write Numbers in APA Style

Kristen white, 25 jun 2018.

How to Write Numbers in APA Style

Style guidelines from the American Psychological Association (APA) help writers maintain a uniform way of writing. Because APA style is used for scientific and clinical writing, numbers are often included. Readers can more easily understand information when it is consistently communicated in one way. Many APA rules also help save space because the rules seek to increase clarity in presentation.

Explore this article

  • Most Common Rule
  • Other Rule Exceptions
  • Other Commonly Used Style Rules

1 Most Common Rule

The most common and frequently used rule for writing numbers in APA style is determined by whether the number is under 10. All numbers below 10 should be written out in word form. For example, numbers like four or seven. Numbers 10 and above are written as a numeral like 10, 17 and 233. One of the exceptions to this rule is when a sentence starts with a number. In this case, the number is always written out as a word. For example, "Fifteen students were sick; two teachers went home." To avoid confusion and preserve consistency when writing numbers in APA style, try to avoid starting a sentence with a number.

2 Other Rule Exceptions

Another exception to writing out numbers under 10 is when writing a specific measurement, amount, date, age or money. In this case, the number should be written as a numeral: 8 miles, 4 cents, a 7-year-old boy, 6 weeks ago, 3 hours before dinner and a $2 fine. Finally, in APA style consistency in presentation is key even if it means bending the rules. For example, you would write "6 out of 10 dentists preferred the last treatment" instead of "six out of 10."

3 Other Commonly Used Style Rules

A commonly used number rule in APA style is to write out fractions as words. For example, write "half" instead of 1/2. But, if a fraction is unusual, such as 3/16, then use the numeral form. For decimal usage, always place a "0" before the decimal: 0.91, for example. And finally, when writing about percentages, always use a numeral, even if the number is less than 10. For example: 7% of people surveyed did not respond to the question. APA rule 4.31 also stipulates using "numerals to express numbers that represent time, dates, ages, scores and points on a scale, exact sums of money and numerals as numerals." The same rule continues on to state the exception of using words for approximations of numbers when words like "almost" or "about" precede the number. Symbols like % and $ are used in APA style when they are preceded by a number that is not spelled out as a word and especially in charts and graphs to preserve space.

  • 1 Walden University Online Writing Center: Numbers
  • 2 APA Style Blog: How To Write Grade Numbers in APA Style
  • 3 Purdue Owl: APA Style
  • 4 APA Style Blog: Comparing MLA and APA Numbers
  • 5 University Writing Center: The Rules Regarding the Use Numerals in APA and MLA styles
  • 6 Academia: In APA style, How should rough financial numbers be written?

About the Author

Kristen White is a professional journalist with more than 13 years of experience writing for newspapers and magazines such as "Caesar's Player" and "ProRodeo Sports News." She also contributes to various websites. White has a Bachelor of Arts in journalism.

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APA Writing Style | Language & Punctuation Guidelines

Published on January 3, 2022 by Jack Caulfield . Revised on October 3, 2023.

The American Psychological Association (APA) published the 7th edition of its style manual in 2019. As well as rules for citation and paper formatting, the manual provides various language guidelines to help you present your ideas in a clear, concise, and inclusive manner.

Key issues include active vs. passive voice, use of pronouns, anthropomorphism, inclusive language, punctuation, abbreviations and acronyms, and numbers.

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Table of contents

Active vs. passive voice, personal pronouns, anthropomorphism, inclusive language, punctuation, abbreviations and acronyms, numbers: words vs. numerals, hyphenation of prefixes and suffixes, other style issues, frequently asked questions about apa language guidelines.

The passive voice , which places the focus on the object of an action rather than on who or what is carrying it out (the agent ), is often overused in academic writing. It can be long-winded, and it sometimes obscures your meaning if you don’t specify the agent.

  • The test was completed. [passive voice, agent unclear]
  • The test was completed by the participants. [passive voice, long-winded]
  • The participants completed the test. [active voice]

APA therefore recommends using the active voice by default. However, that doesn’t mean you can never use the passive voice. When it’s unimportant who carried out a particular action, the passive voice is a better choice.

  • James and I mounted the projector on the wall.
  • The projector was mounted on the wall.

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apa number writing rules

Appropriate use of personal pronouns is key to maintaining an academic tone in your writing.

First-person pronouns (I, we) should be used when referring to your own actions and thoughts. Don’t refer to yourself in the third person.

  • The researcher(s) administered the test.
  • I/we administered the test.

However, avoid the editorial “we,” which involves using “we” to make a generalization about the world or about a group of people.

  • We are social creatures.
  • Humans are social creatures.

Second-person pronouns (you) should be avoided entirely unless you’re quoting someone else. If you need to make a generalization, use the impersonal pronoun “one” instead, or (usually the better option) rephrase.

  • As a teacher, you should be patient with your students.
  • As a teacher, one should be patient with one’s students.
  • Teachers should be patient with their students.

Use the third-person pronoun “they” to refer to an individual who uses “they” as their chosen pronoun. Also use “they,” not “he or she,” to refer to a generic individual whose gender is unknown or irrelevant in the context.

  • When a student agrees to participate, he or she is provided with the necessary materials.
  • When a student agrees to participate, they are provided with the necessary materials.
  • When students agree to participate, they are provided with the necessary materials.

Anthropomorphism means attributing actions to objects that cannot literally take those actions. Avoid doing this where it confuses your meaning, but feel free to do so when your point remains clear.

  • The study wondered whether an algorithm could predict student engagement.
  • The researcher wondered whether an algorithm could predict student engagement.
  • The table presents the algorithm’s predictions and their accuracy.
  • The results suggest that software can help schools improve student well-being.

APA also provides guidance on ensuring your language is inclusive and respectful. Some key points are summarized below.

  • Replace terms that are unnecessarily gendered or that have sexist connotations with more inclusive alternatives (e.g., change “fireman” to “firefighter”).
  • As mentioned above, use “they” to refer to a person who uses “they” as their chosen pronoun and to refer to a generic individual of unknown gender.
  • Capitalize “Black” and “White” when used in the racial sense. Don’t use colors to refer to other racial groups. Also capitalize terms like “Native American,” “Hispanic,” “Indigenous,” and “Aboriginal.”
  • Don’t hyphenate terms such as “Asian American” or “African American” in any position.
  • Generally, avoid using adjectives as nouns to label groups of people. For example, prefer “people living in poverty” over “the poor.” This emphasizes that poverty is a circumstance in people’s lives, not an essential quality of their existence.

Besides following general punctuation rules , pay attention to these points when writing in APA Style.

  • Always use a comma after the Latin abbreviations “e.g.” and “i.e.”
  • Similarly, use a comma after an introductory phrase , even if it’s only a single word. For example, “Conversely, the results of …”
  • For proper hyphenation of words, follow Merriam-Webster or, for psychological terms, the APA Dictionary of Psychology .
  • Hyphenate fractions only when they are used as adjectives (e.g., “two thirds of the participants,” but “a two-thirds majority”).
  • Always use the serial comma (aka Oxford comma ), which means placing a comma before the “and” preceding the final item in a list of three or more items. For example, “grammar, usage, and style.”
  • Use double quotation marks, and place a comma or period following a quote inside the quotation marks .

Proper use of abbreviations and acronyms is important, since they help keep your writing concise but can be confusing if used inconsistently or without proper explanation.

  • Define an acronym when you first mention it, and use it consistently after that point. You don’t need to define very well-known acronyms like “TV” and “DNA” or abbreviations for standard units of measurement (e.g., “min” for “minute”).
  • Redefine an abbreviation in each figure and table in which it appears. The purpose of defining abbreviations in the table or figure is that if other authors reuse the work in a future paper, then the definitions of the terms will be attached.
  • Avoid using an acronym in your paper title, except in cases where the acronym is used more commonly than the full term (e.g., “DNA” or “HIV”). You can use acronyms in headings only if they are similarly common or have been defined in the text before that heading.
  • It’s fine to begin a sentence with an acronym or abbreviation. However, never begin a sentence with a lowercase abbreviation or a standalone symbol.
  • Use periods in the terms “U.S.” and “U.K.” only when they are used as adjectives, not when they are used as nouns. Do not use periods in abbreviations of state, province, or territory names (e.g., “NY”).
  • Use the Latin abbreviations “e.g.,” “i.e.,” and “etc.” only in parentheses or within bullet-point lists. APA considers them too informal for the main text.

As a general rule, spell out numbers for zero through nine and use numerals for 10 and above . However, note the following exceptions.

Always use numerals:

  • When a number directly precedes a unit of measurement (e.g., 5 cm)
  • When referring to statistics, equations, fractions, decimals, percentages, or ratios
  • When a number represents time, dates, ages, scores, points on a scale, exact sums of money, or numerals as numerals (but use words for approximations of numbers of days, weeks, months, or years)
  • When referring to a specific place in a numbered series
  • In the abstract of a paper (this allows you to save space in the character limit)

Always use words:

  • For any number that begins a sentence, title or heading (but where possible, rephrase to avoid the issue)
  • For common fractions (e.g., “one fifth”)
  • For universally accepted usage (e.g., “Twelve Apostles,” “Five Pillars of Islam”)

Use a combination of numerals and words to express back-to-back modifiers (e.g. “2 two-way interactions” or “ten 7-point scales”). In such situations, a combination of numerals and words increases the clarity and readability of the phrase.

Note that when referring to a numbered element of your text, you should use a numeral and capitalize the word preceding it (e.g., “Chapter 2,” “Table 4”).

Prefixes and suffixes are added to words to alter their meaning—prefixes to the start of the word, suffixes to the end. For example, by adding the prefix “post-” to the adjective “natal,” you get another adjective, “postnatal.”

It’s often not clear whether such terms should be hyphenated or written as one solid word. APA helpfully provides a list of prefixes and suffixes that don’t require hyphenation according to their guidelines.

But do hyphenate:

  • The prefix “self-” (e.g., “self-deprecating”)
  • The word “quasi-experimental”
  • Prefixes that end with “a,” “i,” or “o” when the following word starts with the same letter (e.g., “meta-analysis,” “anti-intellectual”)
  • When attaching to a number, abbreviation, or capitalized word (e.g., “pre-1914,” “post-Napoleonic”)
  • To avoid ambiguity (e.g., “re-form” to mean “form again” as opposed to the usual meaning of “reform”)

APA’s guidelines are extensive. Read more about other style issues not covered in this article by following the links below:

  • APA Style citation
  • Paper formatting and layout
  • Headings and subheadings
  • Tables and figures
  • Reporting statistics
  • Block quoting

Yes, APA language guidelines encourage you to use the first-person pronouns “I” or “we” when referring to yourself or a group including yourself in your writing.

In APA Style, you should not refer to yourself in the third person. For example, do not refer to yourself as “the researcher” or “the author” but simply as “I” or “me.” Referring to yourself in the third person is still common practice in some academic fields, but APA Style rejects this convention.

Yes, it’s perfectly valid to write sentences in the passive voice . The APA language guidelines do caution against overusing the passive voice, because it can obscure your meaning or be needlessly long-winded. For this reason, default to the active voice in most cases.

The passive voice is most useful when the point of the sentence is just to state what was done, not to emphasize who did it. For example, “The projector was mounted on the wall” is better than “James and I mounted the projector on the wall” if it’s not particularly important who mounted the projector.

Yes, APA language guidelines state that you should always use the serial comma (aka Oxford comma ) in your writing.

This means including a comma before the word “and” at the end of a list of three or more items: “spelling, grammar, and punctuation.” Doing this consistently tends to make your lists less ambiguous.

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Reference List: Basic Rules

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This resourse, revised according to the 7 th  edition APA Publication Manual, offers basic guidelines for formatting the reference list at the end of a standard APA research paper. Most sources follow fairly straightforward rules. However, because sources obtained from academic journals  carry special weight in research writing, these sources are subject to special rules . Thus, this page presents basic guidelines for citing academic journals separate from its "ordinary" basic guidelines. This distinction is made clear below.

Note:  Because the information on this page pertains to virtually all citations, we've highlighted one important difference between APA 6 and APA 7 with an underlined note written in red.  For more information, please consult the   Publication Manual of the American Psychological Association , (7 th  ed.).

Formatting a Reference List

Your reference list should appear at the end of your paper. It provides the information necessary for a reader to locate and retrieve any source you cite in the body of the paper. Each source you cite in the paper must appear in your reference list; likewise, each entry in the reference list must be cited in your text.

Your references should begin on a new page separate from the text of the essay; label this page "References" in bold, centered at the top of the page (do NOT underline or use quotation marks for the title). All text should be double-spaced just like the rest of your essay.

Basic Rules for Most Sources

  • All lines after the first line of each entry in your reference list should be indented one-half inch from the left margin. This is called hanging indentation.
  • All authors' names should be inverted (i.e., last names should be provided first).
  • For example, the reference entry for a source written by Jane Marie Smith would begin with "Smith, J. M."
  • If a middle name isn't available, just initialize the author's first name: "Smith, J."
  • Give the last name and first/middle initials for all authors of a particular work up to and including 20 authors ( this is a new rule, as APA 6 only required the first six authors ). Separate each author’s initials from the next author in the list with a comma. Use an ampersand (&) before the last author’s name. If there are 21 or more authors, use an ellipsis (but no ampersand) after the 19th author, and then add the final author’s name.
  • Reference list entries should be alphabetized by the last name of the first author of each work.
  • For multiple articles by the same author, or authors listed in the same order, list the entries in chronological order, from earliest to most recent.
  • Note again that the titles of academic journals are subject to special rules. See section below.
  • Italicize titles of longer works (e.g., books, edited collections, names of newspapers, and so on).
  • Do not italicize, underline, or put quotes around the titles of shorter works such as chapters in books or essays in edited collections.

Basic Rules for Articles in Academic Journals

  • Present journal titles in full.
  • Italicize journal titles.
  • For example, you should use  PhiloSOPHIA  instead of  Philosophia,  or  Past & Present   instead of  Past and Present.
  • This distinction is based on the type of source being cited. Academic journal titles have all major words capitalized, while other sources' titles do not.
  • Capitalize   the first word of the titles and subtitles of   journal articles , as well as the   first word after a colon or a dash in the title, and   any proper nouns .
  • Do not italicize or underline the article title.
  • Deep blue: The mysteries of the Marianas Trench.
  • Oceanographic Study: A Peer-Reviewed Publication

Please note:  While the APA manual provides examples of how to cite common types of sources, it does not cover all conceivable sources. If you must cite a source that APA does not address, the APA suggests finding an example that is similar to your source and using that format. For more information, see page 282 of the   Publication Manual of the American Psychological Association , 7 th  ed.

COMMENTS

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    In general, APA style recommends using words to express numbers below 10, and using numerals when expressing numbers 10 and above. See below for a more extensive list. Cite your source automatically in MLA or APA format Cite Using citation machines responsibly Powered by Numbers expressed as numerals

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    Basics of Numbers. Per APA 7, Section 6.32, use numerals to express numbers 10 or above (e.g., 11, 23, 256). Per Section 6.33, write out numbers as words to express numbers up to nine (e.g., three, seven, eight). Take the APA Style Diagnostic Quiz to test your knowledge.

  6. Reporting Statistics in APA Style

    Use two or three decimal places and report exact values for all p values greater than .001. For p values smaller than .001, report them as p < .001.. Leading zeros. A leading zero is zero before the decimal point for numbers less than one. In APA Style, it's only used in some cases. Use a leading zero only when the statistic you're describing can be greater than one.

  7. APA Style 6th Edition Blog: Numbers and metrication

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    Basic Number Rule. APA style has special rules for expressing numbers within a research papers. For more detailed information on numbers, please see pages 178-181 in the APA 7th edition manual. When using numbers in APA, keep these two basic rules in mind. • Use words instead of numerals when expressing numbers one through nine.

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    The essential rules for using the verbal expression of numbers in your writing are that you should use words when: APA recommends the use of the metric system when referring to physical measurement units for the greatest global comprehensibility of your writing.

  10. APA Tables and Figures

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  11. How to Write Numbers in APA Style

    The simplest thing to remember is, write out numbers below ten, and use numerals for numbers ten and greater. For example, "We interviewed three men and five women." "We surveyed 42 retail managers." However, there are some important exceptions to this rule. Below, I'll detail the full requirements for APA numbers.

  12. APA Formatting and Citation (7th Ed.)

    Throughout your paper, you need to apply the following APA format guidelines: Set page margins to 1 inch on all sides. Double-space all text, including headings. Indent the first line of every paragraph 0.5 inches. Use an accessible font (e.g., Times New Roman 12pt., Arial 11pt., or Georgia 11pt.).

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    This section includes key suggestions, explains how to write in APA format, and includes other tidbits to keep in mind while formulating your research paper. Verb usage in APA. ... Other APA formatting number rules to keep in mind: Always include a zero before a decimal point 0.13 g; Keep Roman numerals as is. Do not translate them into Arabic ...

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    Basic Rules Basic guidelines for formatting the reference list at the end of a standard APA research paper Author/Authors Rules for handling works by a single author or multiple authors that apply to all APA-style references in your reference list, regardless of the type of work (book, article, electronic resource, etc.) Articles in Periodicals

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    A commonly used number rule in APA style is to write out fractions as words. For example, write "half" instead of 1/2. But, if a fraction is unusual, such as 3/16, then use the numeral form. For decimal usage, always place a "0" before the decimal: 0.91, for example.

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  18. PDF Student Paper Setup Guide, APA Style 7th Edition

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  20. Reference List: Basic Rules

    Reference List: Basic Rules. This resourse, revised according to the 7 th edition APA Publication Manual, offers basic guidelines for formatting the reference list at the end of a standard APA research paper. Most sources follow fairly straightforward rules. However, because sources obtained from academic journals carry special weight in research writing, these sources are subject to special ...