Spell them out. It looksmoreprofessional. Unless it is a year or a date (don'tuse something like 1/22/13, use something more like January, 22, 2013)
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Not if you're doing a math problem.
spell HELLO, you will reverse the numbers so that they read 0.7734.
I spell them correctly.
With numbers and acronyms, use an apostrophe s. When in doubt, you can always spell it out.
1,000,000