The factors of 56 are:
1, 2, 4, 7, 8, 14, 28, 56
The factors of 63 are:
1, 3, 7, 9, 21, 63
The factors of 81 are:
1, 3, 9, 27, 81
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The factors of 63 are 1,3,7,9,21, and 63 The factors of 56 are 1,2,4,7,8,14,28 and 56. The factors that are shared are 1 and 7. So the common factors of 63 and 56 are 1 and 7.
The common factors of 63 and 56 are: 1, 7
63: Factors are 1, 3, 7, 9, 21 and 63 125 Factors are 1, 5, 25 and 125
GCF(35, 56, 63) = 7.
The GCF is 9.