Spell out whole/round numbers one through one hundred. For example, “thirty-two children from eleven families were packed into three vans”. Use numerals for other numbers, unless the number starts a sentence. Series of numbers: All numbers must be numeral.
Rules for units of measurement: Punctuation: don't place a full stop after a unit of measurement. Capitalisation: use capitals only if the unit represents a proper name. Plural and possessive: units don't have a plural or possessive form. Start of a sentence: write out the unit in full.
Chicago recommends using words, not numerals, for numbers lower than 100. For example, you would write “ninety-five,” not “95.” But numerals should still be used when you're referring to a specific measurement (e.g., “15 cm”) and when using decimals (e.g., “1.5”).
How to format a Chicago-style paper One inch margins on sides, top and bottom. Use Times or Times New Roman 12 pt font. Double-space the text of the paper. Use left-justified text, which will have a ragged right edge. Use a 1/2" indent for paragraph beginnings, block quotes and hanging (bibliography) indents.
In Chicago's default style for numbers, whole numbers under 101 are usually spelled out, as in three or ninety-three. Chicago's alternative rule spells out numbers up to and including nine.
Units of measure can be written as symbols, words, or abbreviations. For basic units of measurement, use words: 25 pounds, 12 inches. For derived units of measure — ones formed using a calculation — use symbols: 38mph, 27ft/s2.
Artwork (Print or Web) Fig. #, Artist's Last-name, First-name, "Title of Work," Medium, Date of Creation, Location of Work-Institution/City/Owner, In Title of Print Source, by Author of Source, Page or plate/figure number, Place of Source Publication: Publisher, Date. Example: Fig.
Rule to Remember Spell out numbers below 10 in MLA style or below 100 in APA style.
Q. Which is the proper spelling of a generic age: 30s and 40s or 30's and 40's? A. Chicago's preferred style is thirties and forties, but if you need to use numerals, we recommend leaving out the apostrophes.