MLA Style Guide: Using Numbers

1. Numbers that can be expressed in either one or two words should be written out. 

            Examples:

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

2. Numbers that are longer than two words or are similar to the following examples should be typed numerically.

Examples:

• 2 ½
• 8.3
• 101
• 1,275
• $5.50
• 3 kilograms
• 4.5 million

3. Always spell out the number in sentences that begin with a number.

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

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

1. Numerals should also be used in front of units of measurements.

Example: 5 millimeters

2. Always use numerals with abbreviations such as 6 lbs., 4:20 p.m., $9, 2”, 4%.
3. With dates: Example: April 1, 2014
4. With decimals or fractions: Example: 9.2

Exceptions:

1. For large numbers, you may use a combination of numerals and words.

Example: 4.5 million

2. 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.