462, 924, 1386 and so on.
What is the common multiples of 22 and 44? I think it is 1,2,11,22
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
there are infinite amount of common multiples.
The common multiples of 9 and 21 are 63, 126, 189 and so on.
Two common multiples of 21 and 15 are 105 and 315.
The common multiples of 3 and 21 are 21, 42, 63 and so on.
-21 and -1
Multiply 21 and 11 to get a common multiple. Since 21 and 11 have no common factors, that also happens to be the least common multiple.All other common multiples are multiples of this least common multiple.
The common multiples of 22, 24, and 45 are 3960, 7920, 11880, and so on.
22, 44, 66
The common multiples of 4 and 22 are 44, 88, 132 and so on.
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, ...