If your writing contains numbers, the general rule is to spell out inletters all the numbers from zero to nine and use numerals for largernumbers; but there are exceptions. If what you’re writing is full ofnumbers and you’re doing math with them, stick with numerals.Approximations like “about thirty days ago” and catch-phrases like “hisfirst thousand days” are spelled out. Large round numbers are oftenrendered thus: “50 billion sold.” With measurements, use numerals: “4inches long.” Never start a sentence with a numeral. Either spell outthe number involved or rearrange the sentence to move the number to alater position.See also “.”
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