Express fractions in words or as decimals whenever possible.
Examples
Tighten the screws one-quarter turn only.
The distance between the modem and the terminal must not exceed 6.5 feet.
Exception for large fractions or uncommon fractions
Words or decimal equivalents are impractical forms for large fractions or uncommon fractions. In these cases, use numerals and a slash to separate the numerator from the denominator, as in the phrase 7/64-inch hexadecimal wrench.
Hyphenating spelled-out fractions
Hyphenate spelled-out fractions, whether you use the fractions as adjectives or nouns.
Examples
Scroll down one-third of the page to the Date field.
Tighten the screws one-quarter turn only.
Using multiple fractions in the same sentence
If you use two or more fractions in the same sentence, use the same form for each fraction.
Preferred
Discouraged
Use the 7/64-inch hexadecimal wrench to tighten the screws 1/4 turn only.
Use the 7/64-inch hexadecimal wrench to tighten the screws one-quarter turn only.
