The lowest common multiple of 21 and 34 is 714. Therefore, the common multiples of 21 and 34 are the multiples of 714. The first five are:
1 x 714 = 714
2 x 714 = 1428
3 x 714 = 2142
4 x 714 = 2856
5 x 714 = 3570
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there are infinite amount of common multiples.
The common multiples of 9 and 21 are 63, 126, 189 and so on.
21 and 28
LCM(21, 49, 56) = 1176
63