Since 21 is a factor of 63, all of its factors are common.
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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.
There cannot be common factors of just one number. To be common there need to be at least two numbers.
Factors of 15 are 1, 3, 5, and 15. Factors of 63 are 1, 3, 7, 9, 21, and 63. The greatest common factor of 15 and 63 is 3.
The factors of 6 are:1, 2, 3, 6The factors of 63 are:1, 3, 7, 9, 21, 63The common factors are:1, 3The Greatest Common Factor (GCF) is: 3