What is the greatest common factor of 30 and 105?

Answer 1

To get the Greates Common Factor (GCF) of 30 and 105 we need to factor each value first and then we choose all the copies of factors and multiply them:

30: 2 3 5 105: 3 5 7 GCF: 3 5

The Greates Common Factor (GCF) is: 3 x 5 = 15

Answer 2

The highest common factor of 30 and 105 is 15.

Answer 3

15 is the highest/greatest common factor.