How do you get the greatest common factor of 42 to 63 and 105?

Answer 1

The factors of 42 are:

1, 2, 3, 6, 7, 14, 21, 42

The factors of 63 are:

1, 3, 7, 9, 21, 63

The factors of 105 are:

1, 3, 5, 7, 15, 21, 35, 105

The common factors are:

1, 3, 7, 21

The Greatest Common Factor:

GCF = 21