Do not use case fractions. Use decimal numerals for measured magnitudes, and use words with other simple fractions.

  • Insert a 3.5-inch disk into your drive. (Not 3 1/2-inch or 3½-inch.)
  • This year, three-fourths of the food was consumed by engineers.
  • If space is a consideration—such as in a table—the use of a fraction is acceptable.

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