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Numbers

FIGURES OR WORDS?

In general, use figures for numbers 10 or higher, including ordinal numbers.
eighth ninth 10th 11th
eight nine 10 11

When several numbers appear together in context, the style of the larger number rules the style of the smaller numbers.
20 hours, 15 minutes, 6 seconds

BEGINNING SENTENCES

Do not begin a sentence with figures. Spell out the figures or recast the sentence to move the figures. 

Exception: It is acceptable to begin a sentence with a figure identifying a calendar year.
1976 was a good year for contributions.

GRADE POINT AVERAGES

Use figures to express GPAs to one decimal place. Add extra decimal places when accuracy is essential.
2.0 . . . 3.5 . . . 3.95

IDENTIFICATION NUMBERS

Use figures.
Channel 12 . . . Highway 35 . . . Henry VIII . . . Apollo 12

MONEY

For amounts of $1 million or more, use the $ sign and numerals for up to two decimal places. Don't use a hyphen between the figure and the word.
worth $4.35 million
over $1 million

For amounts under $1 million:
one dollar . . . $10 . . . $100 . . . $1,000 . . . $100,000

For amounts under $1, use numerals and the word cents. Use the $ sign and decimals for larger amounts.
five cents . . . 12 cents . . . $1.12

PAGES and DIVISIONS

Use figures.
page 10 . . . part 4 . . . exercise 2 . . . chapter 12

PERCENTAGES and DECIMALS

Use figures for decimal fractions and percentages (including academic grades). Use the word percent in general copy. Reserve the percent symbol (%) for use in scientific or statistical copy.
about 3 percent voted . . . 3.8 and 95 are equivalent grades

TIMES

Use figures with A.M and P.M. Ciphers are optional, but their use should be consistent throughout.
11 A.M. . . . 4:00 P.M.

Use words with o'clock under 10, figures over 10.
four o'clock . . . 12 o'clock

 

Hyphenation

GENERAL 

Hyphenate the following when used as compound modifiers: full time, part time, on campus, off campus.
The part-time faculty . . .on-campus housing

Hyphenate a cardinal numeral used with a unit of measurement if the compound precedes a noun.
three-mile limit . . . 100-yard dash . . . 10-meter band . . . four-year-old boy

ADJECTIVE FORMS

The dictionary should be the first source for whether words formed with the prefixes listed below are spelled solid or with hyphens. Lacking dictionary ruling, words formed with this list of prefixes are to be spelled solid when used as adjectives.

pre-, post-
over-, under-
intra-, extra-
infra-, ultra-
sub-, super-
pro-, anti-
re-, un-, non-, semi-
pseudo-, supra-, co-

Exceptions:
1) Second element capitalized or a figure, un-American, pre-1914;
2) To distinguish homonyms, re-cover, re-create;
3) Second element more than one word, pre-Civil War.

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