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The common multiples of 9 and 21 are 63, 126, 189 and so on.
63
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.
Factors: 1 and 3 Multiples: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 and so on.
The multiples of 6 is 6,12,18,24,30,36,42,48,54,60,66,72,78,84,90.................. The multiples of 9 is 9,18,27,36,45,54,63,72,81,90,99,108,117,126,135...............