- Spell out all numbers under 10; use figures for any number 10 or over, except at the beginning of a sentence.
- Follow the same rule for ordinals (first, second, third, etc.).
- 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.
Examples: 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.
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- 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.