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13.3.5 Spell out numbers one to ten

1. Whether to express a number in numerical or written form seems to cause some difficulty for business writers. The usual modern rule is this: if the number is one to ten, spell it out. If higher, use numerals. Many exceptions are self-evident, but one is harder. If you refer to something as ten early in a sentence but later will refer to a higher number of the same sort of item, you might as well use numerals for consistency.

OK: He ordered ten milling machines.

OK: He ordered 10 milling machines, 32 drill presses, and 4 lathes.

2. No sentence should begin with a numeral. This rule just makes good sense, for if the sentence before had ended with a numeral, the reader might mistake the period for a decimal point. Furthermore, signs and symbols, like dollar signs, should not begin sentences.

Poor: I asked him if he was 38. 25 was all he'd admit to.

Better: I asked him if he was 38. He would admit to only 25.

 

Courtesy of John Mercer Associates, www.MercerWriting.com

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