1,2,and 4 and greatest common factor is 4
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The common factors of 63 and 56 are: 1, 7
The common factors of 34 and 56 are 1 and 2
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 34, 56, and 150 are: 1 and 2
The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56