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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

Q: Common multiples of 21 and 34?

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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

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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.

there are infinite amount of common multiples.

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The first 3 COMMON multiples of 17 will depend upon the OTHER NUMBER(S) with which 17 has common multiples. However, they will be regularly spaced within the multiples of 17.eg the first 3 COMMON multiples of:1 and 17 are 17, 34, 51;2 and 17 are: 34, 68, 102;5 and 17 are: 85, 170, 255;17 and 34 are: 34, 68, 102etc.

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.

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Multiples of 21 include 21, 42, 63, 84 and so on. For them to be common, they need to be compared to another set of multiples.

Odd multiples of 21.