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.
3, 9, 15, 21, 27
The common multiples of 9 and 21 are 63, 126, 189 and so on.
There are infinitely many multiples of 9 and 21 so it is impossible to list them. One of their multiples is 9*21 = 189.
Any pair of numbers has an infinite set of common multiples. The lowest common multiple of 9 and 21 is 63 and the others are multiples of this, e.g. 63, 126, 189, 252, 315, ...
9
3, 6, 9, 12, 15, 18, and 21 are.
Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.
63, 126, 189 and so on.
63, 126, 189 and so on.
The LCM is 63.
14 and 21
The LCM is 63
They are: 63, 126.