0
Anonymous
Oh, dude, 9 and 21 both go into numbers that are multiples of both 9 and 21. So, like, they can go into numbers like 63, 126, 189, and so on. It's just basic math, nothing too mind-blowing.
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multiples of 63
Wiki User
1, 3, 7, 9, 21 and 63.
21 and 9 21 - 9 = 12 21+9 = 30
1, 3, 7, 9, 21, 27, 63, 189.
21