LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
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.
there are infinite amount of common multiples.
Multiples of 21 include 21, 42, 63, 84 and 105. For them to be common, they need to be compared to another set of 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 9 and 21 are 63, 126, 189 and so on.
They are multiples of 63
The common multiples of 3 and 21 are 21, 42, 63 and so on.
Common multiples of 9 and 10 are all of the multiples of 90.
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.
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.