Numbers

• Do not begin a sentence with numerals; supply a word or spell out the figures. Please note: Numbers below 100 should be hyphenated when they consist of two words.
  
  

  thirty-nine

Use numerals for

• Numbers 10 or over, including ordinal numbers: 22nd.

• Days of the month, omitting rd, th, st, nd: April 6, June 1.

• Degrees
  
  

  Longitudinal 67 03' 06" W
  215°F below zero (In engineering and technical text, omit degree sign.) No space between degree sign and F.

• Numbers within a series in order to maintain consistency if more than half of the numbers are 10 or over. Otherwise spell out numbers within a series.
  
  

  23 hours, 12 minutes, 6 seconds
  Twelve hats, five purses, five umbrellas, seven sweaters, and sixteen pairs of shoes were sold yesterday.

• Sums that are cumbersome to spell out, but spell out the words million and billion.
  
  

  one million; 17.9 billion

• Hours of the day: 7 p.m. or 7:30 p.m. (never 7:00 p.m. unless used in vertical lists of events, etc., to preserve alignment of type).

• Amounts of money with the word cents or with the dollar sign: $3 (not $3.00); $5.09 or 77 cents, unless tabulated in columns.