The factors of 15 are 3 and 5. The factors of 21 are 3 and 7. So the common factor is 3.
The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105The factors of 147 are: 1, 3, 7, 21, 49, 147The common factors are: 1, 3, 7, 21The Greatest Common Factor (GCF) is: 21
The common factors of 15 and 36 are: 1, 3.
40 and 21 have no common prime factors
The factors of 105 are:1, 3, 5, 7, 15, 21, 35, 105The factors of 441 are:1, 3, 7, 9, 21, 49, 63, 147, 441The common factors are:1, 3, 7, 21The Greatest Common Factor (GCF) is:21
Common factors of 15, 35, and 45 are: 1 and 5.
3
1 and 3
The hcf is 1
1 and 3
The greatest common factor of 15 and 21 is 3The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The GCF is 3.
They have only one and it is 1
The factors of 21 are: 1, 3, 7, 21The factors of 45 are: 1, 3, 5, 9, 15, 45The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3