- The most common, Arabic numerals, are 0, 1, 2, etc.
- Roman numerals use the letters I (1), V (5), X (10), L (50), C
(100), D (500), M (1000) and are used number wars, sequence in family,
rulers, vehicles, major headings in documents.
- Cardinal numbers are 0, zero, 1, one, etc.
- Ordinal numbers are 1st, first, 2nd, second, etc.
- In general, write out the first nine cardinal (1-9) numbers
(except for address numbers 2-9, dates, decimals, game scores, highways,
latitude/longitude, mathematical expressions, measurement/weight,
money/financial data, percentages, proportion, scientific expressions,
statistics, technical expressions, temperature, time, unit modifiers,
votes, and numbers not written out in a proper noun) and any number that
begins a sentence; use figures for 10 and above.
- The first nine ordinal (1st-9th) numbers are usually written
out, especially when describing order in time or location.
- Governmental, political, and military units numbered one hundred
or less are usually written out. Labor unions and other organizations often use figures.
- Numbers of one million and above are easier to read if written
as figures with the word `million’, `billion’, etc.
- Written-out numbers between 21 and 99 and hyphenated.
- Figures of four digits may be written with or without a comma.
- Numbers of checks, contracts, military hours, pages, policies,
rooms/suites, streets, telephone numbers, and years are written without
- Check, telephone, and serial numbers may contain hyphens.
- A fraction used as a modifier is hyphenated, e.g. three-quarter
- A fraction used with a whole number is written as a figure,
e.g. 5 1/2, as are measurements that are fractions, e.g. 1/10 mile.
- A measurement as a modifier is hyphenated, e.g. nine-pound boy.
- Numbers in a series or set are written alike, e.g. `50 to 60
- Street names that are numbers are written out, but may also be
written as figures from 13 and over.
- Document divisions are usually written as figures, e.g. Psalm
100, page 7.
- Ordinal numbers are not used in full dates; commas are not used
in between just a month and year.
- Money designations of one or two words are often written out,
e.g. one dollar.
- Times are usually spelled out in text and may be when used with
`o’clock’. Figures are used for exact times, e.g. 8:13. Times may be used with a.m./A.M.,
p.m./P.M., `o’clock’, or `in the ~’ but those designations should not be
- Year and page numbers may omit hundreds and replace with a
dash, e.g. 1989-90, pp 140-50.
- If an abbreviation or symbol is used with a number, it should
be written as a figure.
- Numbers should not be divided at the end of lines.
- Plurals of written-out numbers are formed by adding `s’ or
- Plurals of figures are formed by adding `s’ or `’s’.