Help for Creators, Rose O'Rua, Writing

COPYEDITING TIPS

Rules for numbers and numerals:

In technical documents use the numeral:  15,  99, 20%, 5 trials, 123 million.

In nontechnical documents spell out whole numbers less that 101:

fifteen, ninety-nine, one hundred, 101, 250, 5,000

—except for percentages, years and dates, page numbers and chapter numbers:

20 percent, 2021, 14 January, page 3, chapter 10.

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