Figures

A. Write out numerals nine and under.

B. Use numbers for:

1. Figures 10 or over, including ordinals, e.g., 22nd.
2. Days of the month, omitting rd, th, st, nd.
   1. April 6, June 1
3. Degrees, ratios, percentages, persons' ages.
   1. longitude 6°7'06"W
   2. 21.5°F below zero
   3. 6 percent
   4. 7 years old
4. Dollars in all except casual references.
   1. The book cost $4.
   2. Dad, please give me a dollar.
5. Apply appropriate guidelines (see No. 1) for items in a series.
   1. They had 10 dogs, six cats and 97 hamsters.
6. Sums that are cumbersome to spell out, but spell out the word million.
   1. 17.9 million
   2. 3 million (note use of digit, since 3,000,000 is being represented)
7. Write phone numbers with the area code set off by a hyphen, e.g., 800-555-1212.
8. Use extended ZIP codes wherever possible.

C. Avoid Unnecessary Ciphers

1. Hours of the day: 7 p.m., 7:30 p.m., noon, midnight. Do not put 12 in front of noon or midnight. Do not say 7 p.m. tonight. Do not use 7:00 except in lists of events, etc., to preserve alignment of type.
2. In amounts of money with the dollar sign: $3 (not $3.00), unless tabulated in columns.
3. Do not begin a sentence with numerals; supply a word or spell out the figures. Please note that numbers below 100 should be hyphenated when they consist of two words.
   1. thirty-nine
4. Do not add a numeral in parentheses after it's written in words:
   1. three copies, not three (3) copies