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  • Spell out all numbers from one to nine; use figures for any number 10 or above, except at the beginning of a sentence. This includes ordinal numbers: first, 1st; 20th, not twentieth, unless it's an official title or data point).
  • Do not use superscript in ordinals. (e.g. 20th, not 20th).
  • Use figures for decimals or compound fractions.
  • Numbers in the millions should be written out as a combination of words and figures.
  • Don’t use "over" or "under" to describe numbers. Use "more than" or "less than".
  • Use figures in sequences such as chapters, acts of a play, school grades, highways, etc.
  • Use figures in ordered lists.


  • Unit 12
  • first-year students
  • teams of 16
  • 20 million people
  • 6 1/2 weeks to go
  • more than $4.5 million in sales
  • children in Grade 4
  • Act 2, Scene 3 of Hamlet

See also Dates and Time

Phone numbers

Use this format: 519-888-4567, ext. 35719

For international audiences, add a "+1-" in front of the telephone number. (Country code for Canada.)  E.g. +1-519-888-4567


  • When referring to amounts of money, use a singular verb.
  • Do not use unnecessary zeroes.
  • Don’t use "over" or "under" to describe amounts. Use "more than" or "less than".
  • Don’t use periods in national currency designations.
  • Hyphenate millions of dollars when part of a compound modifier.

Examples: $7 (not $7.00). $65 CAD, $52 USD. More than $5 million was raised for the fund for writers. Construction of the $70-million building. The $33-million donation.

View the ISO 4217 Currency Codes to see international currency designations.