How do you work out the hcf of 60 and 70?

Answer 1

The factors of 63 are:

1, 3, 7, 9, 21, 63

The factors of 135 are:

1, 3, 5, 9, 15, 27, 45, 135

The Greatest Common Factor:

GCF = 9

Answer 2

The factors of 60 are:

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

The factors of 70 are:

1, 2, 5, 7, 10, 14, 35, 70

The Greatest Common Factor:

GCF = 10