Writing Numbers

Although usage varies, most people spell out numbers that can be expressed in one or two words and use figures for other numbers:

Words

over two pounds

six million dollars

after thirty-one years

eighty-three people

Figures

after 126 days

only $31.50

6,381 bushels

4.78 liters

Here are some examples of specific situations.
Days and Years

December 12, 1965 or 12 December 1965

A.D. 1066

in 1900

in 1971-72 or in 1971-1972

the eighties, the twentieth century

the 1980's or the 1980s

Time of Day

8:00 A.M. (or) a.m. (or) eight o'clock in the morning

4:30 P.M. (or) p.m. (or) half-past four in the afternoon

Addresses

16 Tenth Street

350 West 114 Street

Identification Numbers

Room 8

Channel 18

Interstate 65

Henry VIII

Page and Division of Books and Plays

page 30

chapter 6

in act 3, scene 2 (or) in Act III, Scene ii

Decimals and Percentages

a 2.7 average

13 1/4 percent

.037 metric ton

Large Round Numbers

four billion dollars (or) $4 billion

16,500,000 (or) 16.5 million