Factors of 21 = 1, 3, 7, 21
Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
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The factors of 7 are 1 and 7. Neither of them are multiples of 42. Put the other way, 7, 14, 21 and 42 are multiples of 7 that are factors of 42.
Factors of 126 are 1, 2, 3, 6, 7, 18, 21, 42, 63, 126 Of those factors, 3, 6, 18, 21, 42, 63, 126 are multiples of 3.
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.
The factors of 21 are:1, 3, 7, 21The factors of 63 are:1, 3, 7, 9, 21, 63The common factors are:1, 3, 7, 21
Four. They are 14, 21, 28, and 42.