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The Mayfield Handbook of Technical & Scientific Writing
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Section 9.5


Unless you are following a style guide that specifies otherwise, observe the following guidelines in using numbers.

British and American Formation of Numbers

European and International Standards for Formation of Numbers

General Guidelines for Using Numbers in Nontechnical Prose

When using numbers in nonscientific text, spell out numbers less than one hundred or numbers of any size that begin a sentence. In addition, spell out round numbers of any size and use arabic numerals followed by the terms million and billion to express numbers larger than one million.

seventy-three hours

173 hours

nine hundred thousand

two billion

2.3 million

146 billion

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