Hi, As a very general comment, I'd say these are matters of style rather than matters of right and wrong, correctness or incorrectness. Again very, very generally, spelling the number out in letters increases the level of formality. Best wishes, Clive
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AnonymousThe MIS manager ordered 150 80-GB hard drives.The MIS manager ordered one hundred fifty 80-GB hard drives.Saying "one hundred fifty" would be correct in North American English (American English and Canadian English).