When do I use numerals or words to represent a number?
When writing about literature or a subject that does not require frequent use of numbers, you should spell out numbers that can be written in one or two words (five, twenty-seven, two hundred, three thousand, four million), but use Arabic numerals to represent all others (101, 158, 3,458).
Example: I have ninety-nine problems, but numbers are not one of them.
Example: He was able to stuff 168 envelopes yesterday.However, if you are working with a subject that requires frequent use of numbers, like a scientific paper, you will use numerals for all numbers that precede technical units of measurement (16 amperes, 5 milliliters) and numbers that are presented together and that refer to similar things, like comparisons or experimental data (4 to 15). Spell out all other numbers that can be written in one or two words.
Example: In the ten years covered by the study, the number of participating institutions in the United States doubled, reaching 90, and membership in the six-state region rose from 4 to 15.
Is there anything else I should know about numbers in MLA?
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