1. Spell out numbers one through nine.

2. Use numerals for numbers 10 and above.

3. Use numerals for any number that begins a sentence, title, or heading.

4. Use numerals for any number that is used in a direct quotation.

5. Use a combination of words and numerals for numbers that are used in a combination, such as “15 million”.

6. Use numerals when writing a date.

7. Use numerals when writing a time.

8. Use numerals when writing a percentage.

9. Use numerals when writing a dollar amount.

10. Use numerals when writing a number of pages in a book or article.