- Fractions standing alone, or if followed by of a or of an, are generally spelled out.
 Three-fourths of an inch or three-quarters of an inch (not ¾ inch or ¾ of an inch)
One-half inch or half an inch
One-half of a section (½ of a section)
One-fourth inch or a quarter of an inch
One-tenth
Seven-tenths of 1 percent
One-hundredth
Two one-hundredths
One-thousandth
Three one-thousandths
Twenty-five one-thousandths
- Fractions are used in unit modifiers.
½-inch pipe, not one-half-inch pipe.
½-inch-diameter pipe
1½ to 2¾ pages
¾-mile run
?-point rise
3½ cans; 2½ times
- Do not use a comma in a built-up fraction of four or more digits or in decimals
(e.g., 1/3600).
- Use fractions (¼, ½, ¾, ?, ?, ?) or the mark with full-sized figures (1/2, 1/3600) only
if either is specifically requested.
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