The common factors are: 1, 3
The common factors of 6, 21, and 39 are 1 and 3
factors of 63 =7*9 or 7*3*3 factors of 78=2*39, or 2*3*13 the GCF is 3
Common factors of 10 and 63 are: 1.
The common factors of 28 and 63 are: 1 and 7
The common factors of 63 and 91 are 1 and 7.
The common factors of 30 and 63 are 1 and 3.
The common factors of 35 and 63 are: 1 and 7
The common factors of 15 and 63 are: 1 and 3
The common factors of 21 and 63 are 1, 3, 7, and 21
Since 13 is a factor of 39, all of its factors are common.
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.
The common factors of 54 and 63 are: 1, 3, and 9