The director must persuade nine people to adopt his new hiring policy. This sentence uses numbers correctly.
Small numbers between one and ten (or one and nine, depending on the style manual) should typically be written out in writing, according to a straightforward rule. Numbers that are larger than 10 are written as numerals.
Anything higher than nine can be written in numerals, but numbers up to nine should always be written in words. Alternatively, some manuals advise using words rather than digits if you can express the number in two words or less.
You can write numbers as words (like 100) or as numerals (e.g., 100). One of the most widely used style manuals for academic writing, APA Style, is followed in this essay. In general, numbers 0 through 9 should be expressed using words, whereas numbers 10 and higher should be expressed using numerals.
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