Spell out fractions less than one that are not used as modifiers, using hyphens between the words: two-thirds, four-fifths, seven-sixteenths. In quotations, use figures for fractions, with a forward slash and a full space between the whole number (if any) and the fraction: “He was 2 1/2 laps behind with four to go.” Use numerals for precise amounts larger than one, converting to decimals whenever practical: 2.5.
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