Writing Numbers in English

The rules of usage vary, but you should spell out numbers that can be expressed in one or two words. Use figures for the other cases.
Examples
exactly three pounds
two thousand dollars
about twenty-six years
thirty-two people
just 268 days until Christmas
cost $46.15
1,238 tons
116.3 gallons


Repeat numbers on checks and legal documents
exactly one hundred ($100.00) dollars

Numbers in series should be consistent
two oranges, six apples, and four bananas
NOT: two oranges, 6 apples, and 4 bananas

Do not begin a sentence with a number.
Seven boys played football.
NOT: 7 boys played football.

Use combination of figures and words when it will make the writing clearer.
The class had 6 three-year-old girls.
NOT: The class had 6 3-year-old girls.

Some examples of some situations Days and Years
July 4, 1776
B.C 314
in 1950-52 or 1950-1952
the sixties

Time of Day
at 9:00 A.M. or a.m.
at nine in the morning
2:30 P.M. or p.m.
half-past two in the afternoon

Addresses
750 Royaldel Lane
123 East 180th Street

Identification Numbers
classroom 9
State Highway 37
building 28

Books and Plays
page 206
chapter 22
in act 2, scene 2
in Act II, Scene ii

Decimals and Percentages
a 3.9 GPA
6.75 percent
.259 tons

Large Round Numbers
two trillion dollars
13,500,000 or 13.5 million