Rules for writing numbers: Spelling out numbers

  • Spell out numbers:

    • Spelling out Round numbers
    • Write a numbers Beginning a sentence
    • When to spell out Mixed numbers
    • Spelling out Compound numbers.
    • Writing out Centuries
  • Use numerals in writing numbers for...
  • Making plurals out of numbers

Numbers in nontechnical contexts, the following are spelled out: whole numbers from one through one hundred, round numbers, and any number beginning a sentence. For other numbers, numerals are used

Spell out numbers:

  1. Spelling out Round numbers. By virtue of their rounding, these numbers are imprecise. They are written out.
  2. Beginning a sentence. When numbers or a date are required to open a sentence, write them out.
  3. Mixed numbers? Do not mix numerals with written numbers when they refer to similar things
  4. Spell out Compound numbers. Hyphenate compound numbers from twenty-one to ninety-nine and the written form of fractions.
  5. Writing out Centuries. Write out references to centuries, the eighteenth century, the twenty-first century, in lower cased letters.

Use numerals for

  1. Numbers 10 and above, or numbers under 10 grouped with numbers 10 and above (for example, from 6 to 12 hours of sleep).
  2. Exact statistical measures, scores, sample sizes, and sums (multiplied by 3, or 5% of the sample).
  3. Physical measures are given in the metric system following the International System of Units

To make plurals out of numbers, add s only, with no apostrophe (the 1950s).

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