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Section 9.5


Unless you are following a style guide thatspecifies otherwise, observe the following guidelines in usingnumbers.

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 lessthan one hundred or numbers of any size that begin a sentence. In addition, spell out round numbers of any size and use arabicnumerals followed by the terms million and billionto 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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