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Rules For Writing Numbers in English

 

Except for a few basic rules, spelling out numbers vs. using figures (also called numerals) is largely a matter of writers' preference. Again, consistency is the key.

Rule 1. Spell out all numbers beginning a sentence.

Examples:
Twenty-three hundred sixty-one victims were hospitalized.
Nineteen fifty-six was quite a year.

Note: The Associated Press Stylebook makes an exception for years.

Example: 1956 was quite a year.

Rule 2a. Hyphenate all compound numbers from twenty-one through ninety-nine.

Examples:
Forty-three people were injured in the train wreck.
Twenty-seven of them were hospitalized.

Rule 2b. Hyphenate all written-out fractions.

Examples:
We recovered about two-thirds of the stolen cash.
One-half is slightly less than five-eighths.

However, do not hyphenate terms like a third or a half.

 

Rule 3a. With figures of four or more digits, use commas. Count three spaces to the left to place the first comma. Continue placing commas after every three digits. Important: do not include decimal points when doing the counting.

Examples:
1,054 people
$2,417,592.21

Note: Some choose not to use commas with four-digit numbers, but this practice is not recommended.

Rule 3b. It is not necessary to use a decimal point or a dollar sign when writing out sums of less than a dollar.

Not Advised: He had only $0.60.

Better:
He had only sixty cents.
OR
He had only 60 cents.

Rule 3c. Do not add the word "dollars" to figures preceded by a dollar sign.

Incorrect: I have $1,250 dollars in my checking account.
Correct: I have $1,250 in my checking account.

Rule 4a. For clarity, use noon and midnight rather than 12:00 PM and 12:00 AM.

 Step by step tips for how to write an essay

The basics of writing a sentence
Using the paragraph hamburger to make writing easier.
Writing essays for international exams
Writing for success in the TOEFL test.
The essential grammar rules for TOEFL essay writing.
Everything you need to know about the rules of capitalization.
The rules for writing numbers in English
Using connecting words for essay writing.
Spelling rules for writing in English.
Formal versus informal English.

NOTE

AM and PM are also written A.M. and P.M.a.m. and p.m., and am and pm. Some put a space between the time and AM or PM.

Examples:
8 AM
3:09 P.M.
11:20 p.m.

Others write times using no space before AM or PM.

Example:
8AM
3:09P.M.
11:20p.m.

For the top of the hour, some write 9:00 PM, whereas others drop the :00 and write 9 PM (or 9 p.m., 9pm, etc.).

Rule 4b. Using numerals for the time of day has become widely accepted.

Examples:
The flight leaves at 6:22 a.m.
Please arrive by 12:30 sharp.

However, some writers prefer to spell out the time, particularly when using o'clock.

Examples:
She takes the four thirty-five train.
The baby wakes up at five o'clock in the morning.

 

Rule 5. Mixed fractions are often expressed in figures unless they begin a sentence.

Examples:
We expect a 5 1/2 percent wage increase.
Five and one-half percent was the expected wage increase.

Rule 6. The simplest way to express large numbers is usually best.

Example: twenty-three hundred (simpler than two thousand three hundred)

Large round numbers are often spelled out, but be consistent within a sentence.

Consistent: You can earn from one million to five million dollars.
Inconsistent: You can earn from one million dollars to 5 million dollars.
Inconsistent: You can earn from $1 million to five million dollars.

Rule 7. Write decimals using figures. As a courtesy to readers, many writers put a zero in front of the decimal point.

Examples:
The plant grew 0.79 inches last year.
The plant grew only 0.07 inches this year.

Rule 8a. When writing out a number of three or more digits, the word and is not necessary. However, use the word and to express any decimal points that may accompany these numbers.

Examples:
one thousand one hundred fifty-four dollars
one thousand one hundred fifty-four dollars and sixty-one cents

Simpler: eleven hundred fifty-four dollars and sixty-one cents

Rule 8b. When writing out numbers above 999, do not use commas.

Incorrect: one thousand, one hundred fifty-four dollars, and sixty-one cents
Correct: one thousand one hundred fifty-four dollars and sixty-one cents

Rule 9. The following examples are typical when using figures to express dates.

Examples:
the 30th of June, 1934
June 30, 1934
 (no -th necessary)

Rule 10. When spelling out decades, do not capitalize them.

Example: During the eighties and nineties, the U.S. economy grew.

 

Rule 11. When expressing decades using figures, it is simpler to put an apostrophe before the incomplete numeral and no apostrophe between the number and the s.

Example: During the '80s and '90s, the U.S. economy grew.

Some writers place an apostrophe after the number:

Example: During the 80's and 90's, the U.S. economy grew.

Awkward: During the '80's and '90's, the U.S. economy grew.

Rule 12. You may also express decades in complete numerals. Again, it is cleaner to avoid an apostrophe between the year and the s.

Example: During the 1980s and 1990s, the U.S. economy grew.

 


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