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It's almost 17 years later, but I'll give an answer anyways.
I was taught that numbers should be spelled out if they are under 12 (e.g. "four," "eleven"). If they are 12 or above, they should be written in their number form (e.g. "12," "26," etc.).
Another person answered with saying that numbers being written as words and in their number forms shouldn't go together; however, that