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APA Style Guidelines for Numbers | Words or Numerals?

Published on August 7, 2015 by Sarah Vinz . Revised on July 23, 2023.

Numbers can be written either as words (e.g., one hundred) or numerals (e.g., 100). In this article we follow the guidelines of APA Style , one of the most common style guides used in academic writing .

In general, words should be used for numbers from zero through nine, and numerals should be used from 10 onwards. This is true for both cardinal numbers (e.g., two, 11) and ordinal numbers (e.g., second, 11 th ). However, there are some important exceptions to this rule.

Note that other style guides, such as Chicago Style,  address numbers differently (for example, in Chicago, you use words for numbers up to 100). Regardless of what style guide you follow, the most important thing is to be consistent in how you treat numbers throughout your document.

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Table of contents

Writing percentages, reporting statistical results that include numbers, writing numbers that are accompanied by measurements, writing long numbers, consistency may not be obvious, other interesting articles.

Use numerals for numbers from zero to nine that are followed by a precise unit of measurement.

The samples measured 7 cm in diameter. (“cm” is a unit of measurement)

But: These three samples were subjected to further testing.

Use words for any number that is used to start a sentence, with the exception of years.

Seventy-two thousand ink cartridges are sold every day.

Nineteenth-century novels often feature complicated plot lines.

But: 2008 saw record olive crops throughout the Mediterranean.

Use words for common fractions and set expressions.

According to the survey, two thirds of the employees are dissatisfied.

Understanding the Five Pillars of Islam is a critical first step.

The Fourth of July is traditionally marked by a firework display.

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With percentages, the standard is to use numerals and “%” (not “percent”).

According to the report, 45% of the workforce is employed in the service sector. Only 6% currently work in agriculture.

The main exception is if you are using a percentage to begin a sentence. In this case, use words to express the entire percentage.

Thirteen percent of the patients reported that their symptoms improved after taking the experimental drug.

If your paper includes quantitative research, you probably have data to report. Statistics, mathematical functions, ratios, and percentages are all written using numerals. This is true regardless of whether they are included within a table or as part of the actual text. Keep the following guidelines in mind:

• Report most statistics to two decimal places (such as M = 5.44).
• Report statistics that could never exceed 1.0 to three decimal places (such as p < .001).
• If a value has the potential to exceed 1.0, use the leading zero. If a value can never exceed 1.0, do not use the leading zero.
• Italicize values that are not Greek letters (such as M , SD , p , and F ).
• Include spaces before and after =, >, and <.

The average IQ of the participants was relatively high ( M = 137.33, SD = 4.54).

The results of the second test were statistically significant, t (12) = 4.11, p < .05.

There are further detailed guidelines about reporting statistics in APA .

If a number comes immediately before a unit of measurement, use numerals.

Each patient received  5 mg  of the experimental drug.

The tallest participant was 2.03 m .

Also use numerals for precise ages, times, dates, scores, points on a scale, and amounts of money.

The final score of Ghana 2, Brazil 1 did not represent a decisive victory.

Children under 8 years receive a $50 discount.

But: Most girls start reading when they are about five years old. (“about” makes the number imprecise)

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Longer numbers follow specific rules:

• Use a period to indicate a decimal point.
• Starting with 1,000, use commas to separate every three digits.

The region has an average of 43.75 doctors for every 10,000 people.

Some predict that the number of users will reach 2 billion by 2020.

One of the main reasons why writing numbers is complicated is that consistently applying the rules may lead to a text that actually seems very in consistent. Consider the following paragraphs:

At about the age of seven , the girl’s height was 1.47 m. This placed her in the fifth percentile, although her weight placed her in the top 7% of her class. By the time she was 9 years old, she was taller than half of the boys in her year. Five years later, she was still ranked 15 th .

Thirteen thousand viewers watched the performance of Shakespeare’s Twelfth Night from the park, while another 2,000 watched from the surrounding buildings and 1.2 million watched it on television. As one  out of every 11 residents saw at least part of the play, this one event can definitely be considered a success.

These texts may look awkward because so many different number formats have been used, but don’t be deceived – the above guidelines have all been followed.

If you are not required to strictly follow a particular style (such as APA format ), you may have some flexibility to modify the guidelines presented in this article. Just be sure to apply any modifications you make throughout your entire document.

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When to Spell Out Numbers in Writing: Guide and Examples

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The Rules for Writing Numbers in English 

You may have noticed a theme when it comes to the English language: most rules are not standardized. This (somewhat frustrating) fact is especially true when it comes to spelling out numbers. Should you write them out in words or leave them as numerals? To write numbers properly, you will also need to identify potential differences between major style guides (such as MLA , APA , and Chicago , to name a few) because these guides often outline different rules for using numbers in writing.

To make it easier, let's use an example. Say you're working on a paper evaluating the importance of the local public library in your community. The document will make use of small numbers, large numbers, decades, and statistics. Each type of number may follow a different rule.

Thankfully, when using numbers in writing, you can count on a few conventions that apply to most situations; just be sure to consult your specific style guide if one has been assigned. If you don't have time to review each number yourself, a professional editor or proofreader can ensure that your numbers are written correctly.

Writing Small and Large Numbers

A simple rule for using numbers in writing is that small numbers ranging from one to ten (or one to nine, depending on the style guide) should generally be spelled out. Larger numbers (i.e., above ten) are written as numerals.

For example, instead of writing "It cost ten-thousand four-hundred and sixteen dollars to renovate the local library," you would write, "It cost $10,416 to renovate the local library."

The reason for this is relatively intuitive. Writing out large numbers not only wastes space but could also be a major distraction to your readers.

Beginning a Sentence with a Number

Here is a rule that you can truly rely on: always spell out numbers when they begin a sentence, no matter how large or small they may be.

Incorrect: 15 new fiction novels were on display.

Correct: Fifteen new fiction novels were on display.

If the number is large and you want to avoid writing it all out, rearrange the sentence so that the number no longer comes first.

Revised: There were 15 new fiction novels on display.

Whole Numbers vs. Decimals

Another important factor to consider is whether you are working with a whole number or a decimal. Decimals are always written as numerals for clarity and accuracy.

To revisit our library example, perhaps circulation statistics improved in 2015. If a number falls in the range of one to ten and is not a whole number, it should be written as a numeral.

Incorrect: The circulation of library materials increased by four point five percent in 2015.

Correct: The circulation of library materials increased by 4.5% in 2015.

Paired Numbers (Two Numbers in a Row)

When two numbers come next to each other in a sentence, be sure to spell out one of these numbers. The main purpose of this rule is to avoid confusing the reader.

Incorrect: There were 12 4-year-old children waiting for the librarian to begin story time.

Correct: There were 12 four-year-old children waiting for the librarian to begin story time.

Correct: There were twelve 4-year-old children waiting for the librarian to begin story time.

Decades and Centuries

Decades or centuries are usually spelled out, especially if the writing is formal.

Incorrect: The library was built in the '50s.

Correct: The library was built in the fifties.

If you are referring to a specific year (e.g., 1955), use the numeral.

Consistency Is Key When Using Numbers in Your Writing

Always strive for consistency, even if it overrides a previous rule. For example, if your document uses numbers frequently, it is more appropriate for all numbers to remain as numerals to ensure that usage is uniform throughout. Similarly, if a single sentence combines small and large numbers, make sure that all the numbers are either spelled out or written as numerals.

Incorrect: The library acquired five new mystery novels, 12 new desktop computers, and 17 new periodicals.

Correct: The library acquired 5 new mystery novels, 12 new desktop computers, and 17 new periodicals.

Style Guides May Have Slightly Different Rules for Writing Numbers in Words

Let's complicate things a bit, shall we?

If your work must follow the rules of a specific style guide, understand that various guides all have rules for spelling out numbers that may differ slightly from the rules listed above. For example, MLA style indicates that writers may spell out numbers if they are not used too frequently in the document and can be represented with one or two words (e.g., twenty-four, one hundred, three thousand ). APA style advises that common fractions (e.g., two-thirds ) be expressed as words. A number of specific rules for spelling out numbers are outlined in Section 9.1 of the Chicago Manual of Style.

Your ultimate authority will always be a style guide, but in the absence of one, following the rules outlined above will help you stay consistent in your use of numbers in writing.

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Writing numbers When to use words and when to use numerals

It can be difficult to know how to write numbers in academic writing (e.g. five or 5 , 1 million or 1,000,000 ). This section gives some guidelines on when to use words to write numbers, and when to use numerals . There are also some exceptions to the rule which are considered, i.e. times when you might expect to use words but should instead use numerals. There is also a checklist at the end, that you can use to check the use of numbers in your own writing.

When to use words

In general, words should be used for zero to ten , and numerals used from 11 onwards. The same rule should be applied to ordinal numbers, i.e. use words for first, second up to tenth, and numbers plus 'th' (or 'st') from 11th onwards. However, it is always best to check what the accepted practice is at your university (or in your department/on your course), and remember that some common referencing systems have their own, different requirements, as follows.

• MLA . Use words if the number can be written using one or two words (e.g. three , twenty-seven ).
• APA . Use words for numbers zero to nine.
• Chicago . Use words for numbers zero to one hundred.

Before looking at when to use numerals (which is almost all other situations, see next), it is useful to look at important exceptions.

(1) When the number begins a sentence , you should use words , whatever the size of the number (though if possible, rewrite the sentence so the number is not at the beginning).

• Fifty respondents agreed with the statement.
• There were 50 respondents who agreed with the statement. [ rewritten sentence ]
• 50 respondents agreed with the statement.

(2) When expressing part of a very large round number , e.g. million, billion, you should use words for that large number part (it is common to use abbreviations m for million and bn billion ).

• The population of the earth is now in excess of 7 billion people.
• The population of the earth is now in excess of 7bn people.
• The population of the earth is now in excess of 7,000,000,000 people.
• The population of the UK is approximately 70 million.
• The population of the UK is approximately 70,000,000.

Conversely, numerals should be used rather than words, whatever the size of the number, when large and small numbers are combined , since this makes comparisons easier.

• There were 2 respondents in the first category, and 22 in the second.
• There were two respondents in the first category, and 22 in the second.

When to use numerals

Numerals are used for almost all other situations. These include the following.

• Measurements (e.g. 6 kg, 3 cm, 10 min, 2 hr, 3 days, 6 years, 5 decades )
• Currency (e.g. $10, £50, £60 billion )
• Statistical data , including survey data (e.g. A survey of participants revealed that 4 out of 5 students worked. )
• Mathematical functions (e.g. v 2 = u 2 + 2as )
• Decimals (e.g. 2.5, 4.54 )
• Percentages (e.g. 75% )
• Ratios (e.g. 3:1 )
• Percentiles/quartiles (e.g. the 95th percentile, the 1st quartile )
• Times (e.g. 12.30 a.m., 6 p.m., 16:00 )
• Dates (e.g. Wednesday 25 December 2019 )
• Scores/points on a scale (e.g. This item scored 5 on a 9-point scale )

Other important points

The following are a few other points to remember when using numbers.

• Consistency. You should be consistent in how you write numbers; for example, if write a figure like 7bn in one place, do not write a figure like 5 billion in another.
• Use of commas. When giving numerals of 1,000 or larger, use commas for each thousand, e.g. 5,500, 8,326,500 .
• Use of hyphens. When displaying a range, use a hyphen, with no space, e.g. 30%–50%
• Expressing fractions. Fractions can be written either as numerals e.g. 2/3 or words e.g. two-thirds . If using words, use a hyphen.

American Psychological Association (2019a) Numbers Expressed in Words . Available at: https://apastyle.apa.org/style-grammar-guidelines/numbers/words (Accessed: 26 December, 2019).

American Psychological Association (2019b) Numbers Expressed in Numerals . Available at: https://apastyle.apa.org/style-grammar-guidelines/numbers/numerals (Accessed: 26 December, 2019).

Harvard Wiki (2019) Numbers . Available at: https://wiki.harvard.edu/confluence/display/HSG/Numbers . (Accessed: 26 December, 2019).

University of Bristol (2015) Using numbers . Available at: http://www.bristol.ac.uk/arts/exercises/grammar/grammar_tutorial/page_33.htm (Accessed: 26 December, 2019).

University of New England (nd) Numbers in academic writing . Available at: https://aso-resources.une.edu.au/academic-writing/miscellaneous/numbers/ (Accessed: 26 December, 2019).

University of Oxford (2015) Style Guide . Available at: https://www.ox.ac.uk/sites/files/oxford/media_wysiwyg/University%20of%20Oxford%20Style%20Guide.pdf (Accessed: 26 December, 2019).

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Below is a checklist for using numbers in academic writing. Use it to check your writing, or as a peer to help.

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Author: Sheldon Smith    ‖    Last modified: 16 January 2022.

Sheldon Smith is the founder and editor of EAPFoundation.com. He has been teaching English for Academic Purposes since 2004. Find out more about him in the about section and connect with him on Twitter , Facebook and LinkedIn .

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Discussion essays require you to examine both sides of a situation and to conclude by saying which side you favour.

Problem-solution essays are a sub-type of SPSE essays (Situation, Problem, Solution, Evaluation).

Transition signals are useful in achieving good cohesion and coherence in your writing.

Reporting verbs are used to link your in-text citations to the information cited.

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Rules for Writing Numbers in an Essay

Rules for Using Numbers in APA Format

Four p.m. or 4 p.m.? 1950s or 1950’s? Writing an essay or paper can be challenging enough. Start to consider the various formatting rules that exist for including numbers in your essay, and you might find yourself overwhelmed by the conventions of writing. Fortunately, these rules are actually fairly straightforward and easy to remember. Review and practice them and they’ll soon become second nature, allowing you to spend less time thinking about guidelines and more time thinking about your writing.

Standard Numbers

When writing numbers in your essay, the general rule is that whole numbers below 10 should always be spelled out. You would assert that there are "three cars" or "eight baseballs." Numbers 10 and above should be written in numeral form: "21 bugs," "52 cards." When a number below 10 is grouped with a number above 10, the rule for the higher number takes precedence: "8 to 12 weeks."

Statistical Measures

Exact statistical measures, such as percentages, decimals, and mathematical operations, should always be written in numeral form. For example, “The success rate is 8%,” “Fill 5.5 cartons,” or “Divide the answer by 2.”

Use numerals for dates, times, and ages. For example, "October 27, 1986," "4 p.m.," or "37 years old." Spell out the number when writing out a time, such as "eleven o'clock."

Identification Numbers

Identification numbers should be written as numerals: "Room 7," District 4," "Channel 22."

Write years and decades in numeral form. Something might take place in 2005 or in the 1990s (decades do not use an apostrophe before the "s"). Centuries can be spelled out ("fifteenth century") or written in numeral form ("18th century").

Beginning of Sentence

Numbers that begin a sentence should always be spelled out: "Sixty-seven movies were released last month." However, for prose purposes, avoid using numbers at the beginning of sentences.

Inexact Numbers

Spell out rounded or inexact numbers. Also spell out common fractions. You might say there were "about a thousand" people at a gathering, or that "one-quarter of the audience found it funny."

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• Writing Rules: Spelling Out Numbers

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Rules for Writing out Numbers

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Why do so many people find it difficult to remember the rules for using numbers in formal writing ? Probably because the rules seem a little fuzzy sometimes.

So what can you do? It's no mystery: as with anything, read and study the rules several times, and it will all seem natural, eventually.

Writing Numbers One through Ten

Spell out numbers one through ten, as in this example:

• My little brother ate four apples before dinner and became ill.
• Why do parents always check to see if babies have ten toes?

Writing Numbers Above Ten

Spell out numbers above ten, unless writing the number would involve using more than two words. For example:

• I have sixty-three dead bugs in my collection.
• My cousin has 207 bugs in his.
• This site has given me a thousand helpful hints for my homework.
• My grandmother is seventy-two today.
• My little sister had about 4,763 measles on her face.

Always Spell Out Numbers that Begin Sentences

It would look odd to begin a sentence with a numeral.

• Four hundred fifty people attended the birthday party.

However, you should try to avoid using long, clunky numbers at the beginning of a sentence. Instead of writing that four hundred and fifty people attended a party, you could re-write:

• There were 450 people at the party.

Dates, Phone Numbers, and Time

Use numbers for dates:

• My birthday is on March 16.
• He was born on Valentines Day, 1975.

And use numbers for phone numbers:

• The phone number for the school is 800-555-6262
• The international code for England is 44.

And use numbers for telling time if using a.m. or p.m.:

• The alarm will sound at 7 p.m.
• I make my bed at 7 a.m. each morning.

But spell out times when using "o'clock" or when the a.m. or p.m. are omitted:

• The alarm will sound at seven o'clock.
• I make my bed at seven each morning.
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A Quick Guide to Numbers in MLA Style

• Nov 05, 2020
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Your client might not know all the details of MLA style. As an academic proofreader, then, your work may involve checking that documents follow MLA conventions. Thus, in this post, we’re looking at how to present numbers in academic writing according to MLA style.

Numbers in MLA: Numerals or Words?

MLA style sets out two approaches to numbers. In writing that involves few numbers , the MLA Handbook advises spelling out numbers that can be written as one or two words:

o ne, thirty-six, ninety-nine, one hundred, three million

It also says that plurals of spelled-out numbers should be treated as nouns:

fives, thirties

Other numbers, however, should be presented as numerals:

5¾, 305, 643, 2,798

For writing that uses numbers frequently , meanwhile, the MLA advises:

• Using numerals with units of measurement (e.g., 55 inches , 800 grams ) and other numbers presented alongside them (e.g., comparisons or reports of experimental data).
• Expressing larger numbers as a mix of numerals and words (e.g., 7 million , 1.4 billion ).
• Other numbers should be spelled out if they can be written as one or two words.

In both approaches, the MLA also advises using numerals for:

• Numbers used with abbreviations or symbols (e.g., 8lbs. , 6:00am , $7.90 ).
• Addresses (e.g., 635 New Street , 81 5 th Street ).
• Items in a numbered series (e.g., Year 5 , chapter 3 , volume 4 ).
• Dates (e.g., September 10, 2020 , August 5, 1996 ).
• Decimal fractions (e.g., 5.6 , 3.142 ).

In addition, in both styles, numbers should be spelled out at the start of a sentence (or the sentence should be rephrased to avoid starting with a number). When proofreading, then, make sure the guidelines above are applied consistently according to the document type.

Commas in Numbers

MLA style recommends placing a comma after every third digit in large numbers. For example:

However, commas are not used in page and line numbers , addresses , or four-digit years .

Page Ranges in MLA Style

For a range of page numbers in a citation or the Works Cited list, the MLA says to write the second value in the range in full for numbers up to 99. For example:

For larger numbers, though, only the last two digits of the second number should be given. The exception is when more are necessary for clarity:

The rules for years are a little different. If a range of years begins AD 1000 or later, MLA says to omit the first two digits of the second year if they are the same as the first two digits of the first year. Otherwise, though, you should make sure both years are written in full:

If the years discussed fall between AD 1 and 999, though, follow the general rules for inclusive numbers. And make sure ranges of years that begin before AD 1 are written in full.

Punctuating Number Ranges

In published work, MLA follows the convention of using an en dash for number ranges:

She spent her most productive period (1907 –1912) in Amsterdam.

However, for simplicity, MLA also permits a hyphen for number ranges in student writing:

She spent her most productive period (1907- 1912) in Amsterdam.

If you’re proofreading student work, then, there is no need to replace hyphens in number ranges. You can simply check that ranges are punctuated consistently.

Roman Numerals

Finally, the MLA Handbook also has a few rules for using Roman numerals :

• Capitalized Roman numerals are used for the primary divisions in an essay or book outline and as suffixes for the names of persons (e.g., Part I , Henry VII ).
• Lowercase Roman numerals are only used when citing pages that are so numbered (e.g., in the preface or introduction of a book), with ranges written out in full (e.g., xxv –xxviii , iv –xii ).

If you see Roman numerals in a document, make sure they follow these conventions.

Becoming A Proofreader

Here, we’ve seen what to look out for when proofreading numbers in a document that uses MLA style. But you can learn all about style guides, formatting, and proofreading in general with our Becoming A Proofreader course! Sign up for a free trial today to find out more.

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Writing academically: Numbers

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When using numbers in academic writing you need to decide if it’s more appropriate to use a numeral (e.g. 9) or to write the number in words (e.g. nine). It’s worth checking to see if your department has specific advice on this matter, because individual approaches do vary. In the absence of specific advice, here is some general guidance on the matter:

Basic numbers

• Numbers  up to nine  should always be written in  words,  anything higher than nine can be written in numerals. Alternatively, some guides suggest that if you can write the number in two words or fewer then use words rather than numerals. If you are going to take this approach then you should include a hyphen when writing numbers with two words, e.g. twenty-seven.
• For larger numbers, it is acceptable to use either numerals or words depending on context (e.g. a thousand people/1,000 people), but you should always use numerals in technical writing, e.g. 200,000 km. For less precise larger numbers, the written form is better (e.g. several thousand).

Measurements and decimals/fractions

• Use numerals for units of measurement or time, e.g. 500 km, 10 minutes.
• Always use numerals for decimals and fractions (e.g. 0.5 cm) unless the figures are vague (e.g. around half of the population).
• Units of measurement that modify a noun should be hyphenated, e.g. a 3-year-old child.

Dates, money and time

• Always use numerals for dates, e.g Monday 4 April, 2016.
• Use numerals for money (e.g. His pocket money was exactly £1.00 per week) unless the amounts are vague (e.g. He earned well over a million last year).
• Use numerals for indicating the precise time (e.g. 08:00), or words if the times indicated are vague (e.g. around eight o’clock). 

Combining numbers

• If you need to combine two numbers that run together then use words for the shorter number and numerals for the longer number, e.g. a tower of 1000 ten-pence pieces. 

Starting sentences with numbers

• Avoid starting a sentence with a numeral. Either write the number in words or rearrange your sentence. For example, “Three hundred and sixty-five days make one year” could become “There are 365 days in a year”. If you start a sentence with a year, write “The year” first e.g. “The year 1066 saw one of the most famous battles in English history”.
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Numbers In Academic Writing – APA Style Guidelines

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Numbers are an imperative part of academic writing , serving as vital tools to represent quantitative data, statistical data, or measures in an accurate and precise manner. Numbers are used across various fields, including sciences, humanities, and business. However, adherence to specific rules is necessary in terms of using numbers effectively in academia, which vary depending on the style guide followed. This article will provide insights into how numbers are used appropriately.

Inhaltsverzeichnis

• 1 Numbers in Academic Writing – In a Nutshell
• 2 Definition: Numbers in academic writing
• 3 Numbers in academic writing: Exceptions
• 4 Numbers in academic writing: Percentages
• 5 Numbers in academic writing: Statistical results
• 6 Numbers in academic writing: Measurements
• 7 Numbers in academic writing: Long numbers

Numbers in Academic Writing – In a Nutshell

• Academic writing uses numbers in distinct ways depending on style guide.
• Conventions apply to technical number writing and non-technical number writing.
• Numbers are usually written out from one to nine, and numerals are used from 10.
• Technical data and statistics should always appear as numerals for reference.

Definition: Numbers in academic writing

The APA Style is one of the most widely used academic writing styles and is largely adopted by the behavioral and social sciences. A number can be written both numerically or in words within this style.

Typically, a number from one to nine should be written out as words, while numbers from 10 and above should be written out numerically. This general rule also applies to ordinals (first, 10th). Some exceptions do apply, as found next in this article.

Other writing styles utilize different number rules. The Chicago style , for instance, requires numbers to be written out as words up to 100. The MLA style spells out all numbers that can be written within one or two words (three, one hundred, etc.).

Numbers in academic writing: Exceptions

Exceptions to the general rule above apply in the following cases:

1. All numbers should be represented numerically when they are detailing an exact unit of measurement.

• The rock was chiseled 6 cm deep.

2. Write out numerals as words when they begin a sentence, except when dealing with specific years.

• Eighteenth-century scientists advanced the practice of medicine
• 1921 marked the discovery of insulin.

3. A number should be written out when dealing with fractions, set expressions, or other known numeric titles.

• John Milton crafted the poem in 1626, also referred to as the Fifth of November poem.
• According to sources, one-third of the English population perished from the Black Death.
• Orwell’s Nineteen Eighty-Four is set in an alternative world in the year 1984 .

Numbers in academic writing: Percentages

When dealing with percentages in the APA Style, use numerals followed by the percent sign % , instead of “percent” or the abbreviations, “pct.”, “pct,”, or “pc”.

• The Spanish flu affected over 25% of the US population.

The same rule when beginning sentences with numerals applies to percentages, i.e., they should be written out as words when they start a sentence.

• Twenty-five percent of the US population was affected.

Numbers in academic writing: Statistical results

Reporting statistics in APA and papers that deal with technical numerical language in qualitative research have their own rules.

Here, all data is written in numerals to remain consistent and easily digested. This applies to the main body, tables, and figures sections of a paper.

Other statistical conventions include:

• Report the majority of statistics to two decimal places.
• Report statistics that can’t exceed 1.0 to three decimal places.
• For values that could exceed 1.0, use a leading zero. Those that can’t exceed 1.0 do not feature a leading zero.
• Italicize statistical values that aren’t Greek letters. E.g. SD .
• Spaces should be left before and after equal, more-than, and less-than signs.

Numbers in academic writing: Measurements

Always use numerals for units of measurement.

• Ampules contain 100 mg in 2 ml .

Numerals should be used for precise ages, timescales, dates, score lines, points of scale, and monetary sums.

• The final score was France 4 , and Croatia 2 .
• The students were aged 18 to 21 years in the study.

Imprecise ages and generalizations are not numbered but written out.

• She was roughly six years old based on his estimation.
• The outcome will be approximately seven times .

Numbers in academic writing: Long numbers

Longer numbers have their own set of rules. A period should be used to indicate a decimal point.

Commas are to be used to separate large figures every three digits after 1,000.

For sums exceeding 6 numerals, like 1 million and 1 billion, use a combination of numerals and written language.

• HBO Max had 73.8 million subscribers in 2022.
• This is a considerable growth from its 800,000 subscribers in 2015.

Should you write out numbers in academic writing?

As a general rule of thumb, numbers up to nine should be written out in the APA Style, while anything exceeding 10 should appear as numerals.

How are dates written in academic writing?

Dates are always written as numerals.

How are numbers expressed at the beginning of a sentence?

They are written out when they begin a sentence, except for dates and technical data.

Should I use the word "percent" or its symbol "%"?

The APA Style states that the symbol “%” should be used after numerals, while “percent” should be used for written-out figures.

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• Writing Tips

Writing Tips: How to Use the Number Sign (#)

3-minute read

• 6th February 2020

If you use social media, you probably know the “#” sign or hashtag. This symbol has several names, including the number sign, pound sign, hash sign, and octothorpe. But where does it come from? How else is it used? And how should you use it in your writing ? Let’s take a look.

The History of the Number Sign

The hash sign can be traced to a Roman unit of measure, the libra pondo (or “pound weight”). This was sometimes abbreviated to the symbol “℔,” which evolved into “#” by the nineteenth century . By this point, it was widely known as a “number sign” when used before a number:

Please answer question #2 .

Please answer question number two .

And in the USA, it is also known as the “pound sign.” This is because we sometimes use it to indicate an imperial pound when placed after a number:

We need 2# of beef for the pie.

We need two pounds of beef for the pie.

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Outside North America, however, “hash sign” and “number sign” are more common. To abbreviate the unit of mass, countries like the UK and Australia use the abbreviation “lb” instead.

Modern Uses

Over the years, the hash sign has picked up several other uses, including:

• As a proofreading mark that indicates the need to insert a space.
• In writing music, as it looks similar to a sharp note but is easier to type.
• Inserting comments within code in various programming languages.
• As the notation “###,” which indicates the end of a press release.
• To create hashtags on various social media platforms.

This final use is probably the most common nowadays, as it allows people to quickly find posts on a specific subject or theme (e.g., #proofreading ).

When to Use a Hash Sign in Your Writing

It would be unusual to need the hash or number sign in formal writing , such as an essay. However, as detailed above, this symbol has several uses in different contexts. Using the hash sign to replace the word “number” is common in less formal writing, so it is fine to use it as long as:

• You’re certain the reader will understand how you’re using it.
• It doesn’t undermine the formality of the document.

If you want to be 100% sure you’re using this symbol correctly, though, it never hurts to have your writing proofread. We have expert editors ready to help, so why not submit a document today?

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Chicago Citation Style Guide

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• How Do I Format My Works Cited Page?
• Notes and Bibliography format
• Using Numbers

Using Numbers in an Essay

Spell out numbers that can be expressed in either one or two words.  

•   one million
•   ninety-nine
•   one hundred
•   fifteen hundred

Always spell out the number if a sentence begins with a number.

Example: Two thousand twelve was an election year in the United States.

When Should I Use Numerals?

Use numerals if you are writing an essay about a scientific subject or an essay that includes frequent use of numbers, like statistical findings. 

Always use numerals:

•  in front of units of measurements. Example : 5 millimeters
•  with abbreviations such as 6 lbs., 4:20 p.m., $9, 2”, 4%.
•  in dates: Example: April 1, 2014
•  in decimal fractions: Example: 9.2

Exceptions:  

• For large numbers, you may use a combination of numerals and words. Example: 4.5 million
• In general use numerals with % signs, however, you may spell out percentages or amounts of money if you can do so in three words or less. Example: five dollars, forty-five percent, sixty-eight cents.
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MLA In-Text Citations: The Basics

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MLA (Modern Language Association) style is most commonly used to write papers and cite sources within the liberal arts and humanities. This resource, updated to reflect the MLA Handbook (9 th ed.), offers examples for the general format of MLA research papers, in-text citations, endnotes/footnotes, and the Works Cited page.

Guidelines for referring to the works of others in your text using MLA style are covered throughout the  MLA Handbook  and in chapter 7 of the  MLA Style Manual . Both books provide extensive examples, so it's a good idea to consult them if you want to become even more familiar with MLA guidelines or if you have a particular reference question.

Basic in-text citation rules

In MLA Style, referring to the works of others in your text is done using parenthetical citations . This method involves providing relevant source information in parentheses whenever a sentence uses a quotation or paraphrase. Usually, the simplest way to do this is to put all of the source information in parentheses at the end of the sentence (i.e., just before the period). However, as the examples below will illustrate, there are situations where it makes sense to put the parenthetical elsewhere in the sentence, or even to leave information out.

General Guidelines

• The source information required in a parenthetical citation depends (1) upon the source medium (e.g. print, web, DVD) and (2) upon the source’s entry on the Works Cited page.
• Any source information that you provide in-text must correspond to the source information on the Works Cited page. More specifically, whatever signal word or phrase you provide to your readers in the text must be the first thing that appears on the left-hand margin of the corresponding entry on the Works Cited page.

In-text citations: Author-page style

MLA format follows the author-page method of in-text citation. This means that the author's last name and the page number(s) from which the quotation or paraphrase is taken must appear in the text, and a complete reference should appear on your Works Cited page. The author's name may appear either in the sentence itself or in parentheses following the quotation or paraphrase, but the page number(s) should always appear in the parentheses, not in the text of your sentence. For example:

Both citations in the examples above, (263) and (Wordsworth 263), tell readers that the information in the sentence can be located on page 263 of a work by an author named Wordsworth. If readers want more information about this source, they can turn to the Works Cited page, where, under the name of Wordsworth, they would find the following information:

Wordsworth, William. Lyrical Ballads . Oxford UP, 1967.

In-text citations for print sources with known author

For print sources like books, magazines, scholarly journal articles, and newspapers, provide a signal word or phrase (usually the author’s last name) and a page number. If you provide the signal word/phrase in the sentence, you do not need to include it in the parenthetical citation.

These examples must correspond to an entry that begins with Burke, which will be the first thing that appears on the left-hand margin of an entry on the Works Cited page:

Burke, Kenneth. Language as Symbolic Action: Essays on Life, Literature, and Method . University of California Press, 1966.

In-text citations for print sources by a corporate author

When a source has a corporate author, it is acceptable to use the name of the corporation followed by the page number for the in-text citation. You should also use abbreviations (e.g., nat'l for national) where appropriate, so as to avoid interrupting the flow of reading with overly long parenthetical citations.

In-text citations for sources with non-standard labeling systems

If a source uses a labeling or numbering system other than page numbers, such as a script or poetry, precede the citation with said label. When citing a poem, for instance, the parenthetical would begin with the word “line”, and then the line number or range. For example, the examination of William Blake’s poem “The Tyger” would be cited as such:

The speaker makes an ardent call for the exploration of the connection between the violence of nature and the divinity of creation. “In what distant deeps or skies. / Burnt the fire of thine eyes," they ask in reference to the tiger as they attempt to reconcile their intimidation with their relationship to creationism (lines 5-6).

Longer labels, such as chapters (ch.) and scenes (sc.), should be abbreviated.

In-text citations for print sources with no known author

When a source has no known author, use a shortened title of the work instead of an author name, following these guidelines.

Place the title in quotation marks if it's a short work (such as an article) or italicize it if it's a longer work (e.g. plays, books, television shows, entire Web sites) and provide a page number if it is available.

Titles longer than a standard noun phrase should be shortened into a noun phrase by excluding articles. For example, To the Lighthouse would be shortened to Lighthouse .

If the title cannot be easily shortened into a noun phrase, the title should be cut after the first clause, phrase, or punctuation:

In this example, since the reader does not know the author of the article, an abbreviated title appears in the parenthetical citation, and the full title of the article appears first at the left-hand margin of its respective entry on the Works Cited page. Thus, the writer includes the title in quotation marks as the signal phrase in the parenthetical citation in order to lead the reader directly to the source on the Works Cited page. The Works Cited entry appears as follows:

"The Impact of Global Warming in North America." Global Warming: Early Signs . 1999. www.climatehotmap.org/. Accessed 23 Mar. 2009.

If the title of the work begins with a quotation mark, such as a title that refers to another work, that quote or quoted title can be used as the shortened title. The single quotation marks must be included in the parenthetical, rather than the double quotation.

Parenthetical citations and Works Cited pages, used in conjunction, allow readers to know which sources you consulted in writing your essay, so that they can either verify your interpretation of the sources or use them in their own scholarly work.

Author-page citation for classic and literary works with multiple editions

Page numbers are always required, but additional citation information can help literary scholars, who may have a different edition of a classic work, like Marx and Engels's  The Communist Manifesto . In such cases, give the page number of your edition (making sure the edition is listed in your Works Cited page, of course) followed by a semicolon, and then the appropriate abbreviations for volume (vol.), book (bk.), part (pt.), chapter (ch.), section (sec.), or paragraph (par.). For example:

Author-page citation for works in an anthology, periodical, or collection

When you cite a work that appears inside a larger source (for instance, an article in a periodical or an essay in a collection), cite the author of the  internal source (i.e., the article or essay). For example, to cite Albert Einstein's article "A Brief Outline of the Theory of Relativity," which was published in  Nature  in 1921, you might write something like this:

See also our page on documenting periodicals in the Works Cited .

Citing authors with same last names

Sometimes more information is necessary to identify the source from which a quotation is taken. For instance, if two or more authors have the same last name, provide both authors' first initials (or even the authors' full name if different authors share initials) in your citation. For example:

Citing a work by multiple authors

For a source with two authors, list the authors’ last names in the text or in the parenthetical citation:

Corresponding Works Cited entry:

Best, David, and Sharon Marcus. “Surface Reading: An Introduction.” Representations , vol. 108, no. 1, Fall 2009, pp. 1-21. JSTOR, doi:10.1525/rep.2009.108.1.1

For a source with three or more authors, list only the first author’s last name, and replace the additional names with et al.

Franck, Caroline, et al. “Agricultural Subsidies and the American Obesity Epidemic.” American Journal of Preventative Medicine , vol. 45, no. 3, Sept. 2013, pp. 327-333.

Citing multiple works by the same author

If you cite more than one work by an author, include a shortened title for the particular work from which you are quoting to distinguish it from the others. Put short titles of books in italics and short titles of articles in quotation marks.

Citing two articles by the same author :

Citing two books by the same author :

Additionally, if the author's name is not mentioned in the sentence, format your citation with the author's name followed by a comma, followed by a shortened title of the work, and, when appropriate, the page number(s):

Citing multivolume works

If you cite from different volumes of a multivolume work, always include the volume number followed by a colon. Put a space after the colon, then provide the page number(s). (If you only cite from one volume, provide only the page number in parentheses.)

Citing the Bible

In your first parenthetical citation, you want to make clear which Bible you're using (and underline or italicize the title), as each version varies in its translation, followed by book (do not italicize or underline), chapter, and verse. For example:

If future references employ the same edition of the Bible you’re using, list only the book, chapter, and verse in the parenthetical citation:

John of Patmos echoes this passage when describing his vision (Rev. 4.6-8).

Citing indirect sources

Sometimes you may have to use an indirect source. An indirect source is a source cited within another source. For such indirect quotations, use "qtd. in" to indicate the source you actually consulted. For example:

Note that, in most cases, a responsible researcher will attempt to find the original source, rather than citing an indirect source.

Citing transcripts, plays, or screenplays

Sources that take the form of a dialogue involving two or more participants have special guidelines for their quotation and citation. Each line of dialogue should begin with the speaker's name written in all capitals and indented half an inch. A period follows the name (e.g., JAMES.) . After the period, write the dialogue. Each successive line after the first should receive an additional indentation. When another person begins speaking, start a new line with that person's name indented only half an inch. Repeat this pattern each time the speaker changes. You can include stage directions in the quote if they appear in the original source.

Conclude with a parenthetical that explains where to find the excerpt in the source. Usually, the author and title of the source can be given in a signal phrase before quoting the excerpt, so the concluding parenthetical will often just contain location information like page numbers or act/scene indicators.

Here is an example from O'Neill's  The Iceman Cometh.

WILLIE. (Pleadingly) Give me a drink, Rocky. Harry said it was all right. God, I need a drink.

ROCKY. Den grab it. It's right under your nose.

WILLIE. (Avidly) Thanks. (He takes the bottle with both twitching hands and tilts it to his lips and gulps down the whiskey in big swallows.) (1.1)

Citing non-print or sources from the Internet

With more and more scholarly work published on the Internet, you may have to cite sources you found in digital environments. While many sources on the Internet should not be used for scholarly work (reference the OWL's  Evaluating Sources of Information  resource), some Web sources are perfectly acceptable for research. When creating in-text citations for electronic, film, or Internet sources, remember that your citation must reference the source on your Works Cited page.

Sometimes writers are confused with how to craft parenthetical citations for electronic sources because of the absence of page numbers. However, these sorts of entries often do not require a page number in the parenthetical citation. For electronic and Internet sources, follow the following guidelines:

• Include in the text the first item that appears in the Work Cited entry that corresponds to the citation (e.g. author name, article name, website name, film name).
• Do not provide paragraph numbers or page numbers based on your Web browser’s print preview function.
• Unless you must list the Web site name in the signal phrase in order to get the reader to the appropriate entry, do not include URLs in-text. Only provide partial URLs such as when the name of the site includes, for example, a domain name, like  CNN.com  or  Forbes.com,  as opposed to writing out http://www.cnn.com or http://www.forbes.com.

Miscellaneous non-print sources

Two types of non-print sources you may encounter are films and lectures/presentations:

In the two examples above “Herzog” (a film’s director) and “Yates” (a presentor) lead the reader to the first item in each citation’s respective entry on the Works Cited page:

Herzog, Werner, dir. Fitzcarraldo . Perf. Klaus Kinski. Filmverlag der Autoren, 1982.

Yates, Jane. "Invention in Rhetoric and Composition." Gaps Addressed: Future Work in Rhetoric and Composition, CCCC, Palmer House Hilton, 2002. Address.

Electronic sources

Electronic sources may include web pages and online news or magazine articles:

In the first example (an online magazine article), the writer has chosen not to include the author name in-text; however, two entries from the same author appear in the Works Cited. Thus, the writer includes both the author’s last name and the article title in the parenthetical citation in order to lead the reader to the appropriate entry on the Works Cited page (see below).

In the second example (a web page), a parenthetical citation is not necessary because the page does not list an author, and the title of the article, “MLA Formatting and Style Guide,” is used as a signal phrase within the sentence. If the title of the article was not named in the sentence, an abbreviated version would appear in a parenthetical citation at the end of the sentence. Both corresponding Works Cited entries are as follows:

Taylor, Rumsey. "Fitzcarraldo." Slant , 13 Jun. 2003, www.slantmagazine.com/film/review/fitzcarraldo/. Accessed 29 Sep. 2009. 

"MLA Formatting and Style Guide." The Purdue OWL , 2 Aug. 2016, owl.english.purdue.edu/owl/resource/747/01/. Accessed 2 April 2018.

Multiple citations

To cite multiple sources in the same parenthetical reference, separate the citations by a semi-colon:

Time-based media sources

When creating in-text citations for media that has a runtime, such as a movie or podcast, include the range of hours, minutes and seconds you plan to reference. For example: (00:02:15-00:02:35).

When a citation is not needed

Common sense and ethics should determine your need for documenting sources. You do not need to give sources for familiar proverbs, well-known quotations, or common knowledge (For example, it is expected that U.S. citizens know that George Washington was the first President.). Remember that citing sources is a rhetorical task, and, as such, can vary based on your audience. If you’re writing for an expert audience of a scholarly journal, for example, you may need to deal with expectations of what constitutes “common knowledge” that differ from common norms.

Other Sources

The MLA Handbook describes how to cite many different kinds of authors and content creators. However, you may occasionally encounter a source or author category that the handbook does not describe, making the best way to proceed can be unclear.

In these cases, it's typically acceptable to apply the general principles of MLA citation to the new kind of source in a way that's consistent and sensible. A good way to do this is to simply use the standard MLA directions for a type of source that resembles the source you want to cite.

You may also want to investigate whether a third-party organization has provided directions for how to cite this kind of source. For example, Norquest College provides guidelines for citing Indigenous Elders and Knowledge Keepers⁠ —an author category that does not appear in the MLA Handbook . In cases like this, however, it's a good idea to ask your instructor or supervisor whether using third-party citation guidelines might present problems.