Use words to express numbers when they begin a sentence.
Twelve customers have complained so far.
Note: If this rule creates an awkward sentence, reword the sentence.
Clumsy: Seven hundred forty-two employees signed up for dental care last year.
Better: Last year, 742 employees signed up for dental care.
(From Write for Business, page 212, and Proofreader's Guide PDF, page 14)






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