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The Daily Insight

When to spell a number or write it out?

Author

Christopher Harper

Updated on April 05, 2026

It is generally best to write out numbers from zero to one hundred in nontechnical writing. In scientific and technical writing, the prevailing style is to write out numbers under ten. While there are exceptions to these rules, your predominant concern should be expressing numbers consistently.

When should numbers be written out as words?

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.

Do you spell out ten or write 10?

There are several rules of thought on how to handle writing numbers, but the most common is pretty simple. Spell out numbers under 10 (zero through nine), and use the numeric symbols for numbers 10 and up.

Do you spell out numbers in AP style?

Generally speaking, we follow the guidelines outlined in the AP Stylebook. In body copy, we prefer to spell out numbers one through nine, and use numerals for numbers 10 and greater. We express these numbers with a numeral and a word. For example, 1.6 million people.

What is it called when you write numbers in words?

using figures (also called numerals) is largely a matter of writers’ preference. America’s two most influential style and usage guides have different approaches: The Associated Press Stylebook recommends spelling out the numbers zero through nine and using numerals thereafter—until one million is reached.

Do you spell numbers under 10?

Numbers and ordered events less than 10 in full should be written as words, not numerals (see examples), although there are some exceptions. Numbers with two or more digits should be written as numerals unless they are at the start of a sentence (see examples).

Do you spell out ages?

For ages, hyphenate a compound used as a noun, “He is a 9-year-old,” and as an adjective in front of a noun, “They have a 9-year-old child,” but otherwise no hyphens: “He is 9 years old.” (Note, however, that a 6-year-old celebrates his sixth birthday because, in this context, “sixth” is not an age but a point in a …

How do you write numbers in a sentence?

General Rules

  1. Spell out numbers that begin a sentence:
  2. Spell out numbers used in a casual sense:
  3. Use numerals for numbers 10 and greater and spell out numbers one through nine, with these exceptions:
  4. A note on statistics on the web: Please don’t use statistics outside of stats blocks.

What is the rule for numbers in writing?

For general writing, most guides agree that you should use words for the numbers one through nine, but for larger numbers the rules vary wildly from style guide to style guide. Some say to use words for the numbers one to one hundred, one to ten, any word that can be written with one or two words, and so on.

How do you write numbers in words?

The general rule of thumb is that if the number is one or two words, you should write it out as words, rather than using the numerals. This means that you should write out numbers zero through one hundred. Remember to use a hyphen for numbers twenty-one through ninety-nine.

How do you write a number sentence?

Currency symbols should be placed before the number,with no spaces.

  • Thousands should be separated by commas.
  • Decimals should be separated by periods.
  • When you reach large numbers in the millions and billions,write out the full word (instead of all those zeros).
  • What numbers to spell out?

    Whether to use a numeral or to spell out a number as a word is a matter of style. For general writing, most guides agree that you should use words for the numbers one through nine, but for larger numbers the rules vary wildly from style guide to style guide.