The common factors are: 1, 3
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The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 96 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 The common factors are: 1, 3
There cannot be common factors of just one number. To be common there need to be at least two numbers.
The common factors of 63 and 56 are: 1, 7
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.
Since 21 is a factor of 63, all of its factors are common.