Advanced Details: Writing numbers

Spell out single-digit numbers zero through nine – for example, five workers, eight pumps. Numbers >10 are expressed numerically; for example, 15 cans, 33 valves. Zero is usually written as a numeral and numerals are used when a number >10 appears in a range or list with higher numbers; for example, 0 boxes, 3–4 units, 7–8 pages, 10 million gallons, 445 copies.