There is an infinite number of common multiples for 3 and 7. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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Multiples that are common to two or more numbers are common multiples.
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63...
Multiples of 7 are 7, 14, 21, 28, 35, 42, 49, 56, 63, 70...
So the common multiples are 21, 63...
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.
Any multiple of 105.
21, 42, 63 and so on.
the first three common multiples of 7, 20, and 35 are 140, 280, and 420
The common factors are 1 and 7. (7 = 1 x 7 and 21 = 3 x 7) The only common prime factor is 7, which is also the largest common factor.