Numbers and Numerals
A publication's editorial style for the treatment of numbers includes guidelines for
when to spell out a quantity and when to use a numeral how to treat common numerical expressions (e.g., fractions, percentages, money, time) how to express units of measurement how to treat inclusive numerical ranges how to style mathematical expressions
The two broad sets of conventions for the treatment of numbers are called technical (or scientific) style and nontechnical (or humanistic) style. Technical style is used in technical and scientific writing, of course, but also in other types of documents that typically have many numbers and quantities in them, including statistical and financial material, cookbooks, and do-it-yourself carpentry books. Nontechnical style, in contrast, is often used for pieces that have relatively few numbers in them.
In both technical and nontechnical documents, one rule is absolute: A sentence must never begin with a numeral. Thus a copyeditor must either spell out the numeral or reword the sentence.
Original: 10,500 pages of depositions were submitted by the plaintiff.