- 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
Seven-tenths of 1 percent
- Fractions are used in unit modifiers.
½-inch pipe, not one-half-inch pipe.
1½ to 2¾ pages
3½ cans; 2½ times
- Do not use a comma in a built-up fraction of four or more digits or in decimals
- Use fractions (¼, ½, ¾, ?, ?, ?) or the mark with full-sized figures (1/2, 1/3600) only
if either is specifically requested.