The factors of 63 are 1, 3, 7, 9, 21 and 63. For them to be common, they need to be compared to another set of factors.
Common factors of 10 and 63 are: 1.
The common factors of 28 and 63 are: 1 and 7
The common factors of 30 and 63 are 1 and 3.
The common factors of 15 and 63 are: 1 and 3
The common factors of 63 and 91 are 1 and 7.
The common factors of 21 and 63 are 1, 3, 7, and 21
The common factors of 54 and 63 are: 1, 3, and 9
The common factors of 36 and 63 are 1, 3 and 9
The common factors of 45 and 63 are 1, 3, and 9.
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.
The common factors of 63 and 84 are: 1, 3, 7, and 21