The factors of 14 are:
1, 2, 7, 14
The factors of 63 are:
1, 3, 7, 9, 21, 63
The common factors are:
1, 7
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The multiples of 9, 14 and 21 are infinite, starting with: 126, 252, 378, 504, 630, 756, 882 +126 . . .
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.
630 and all the multiples of 630.
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 . . .
7, 14, 21, 28, 35, 42, 49, 56, 63, 70