What is the greatest common factor of 85 and 70?

Answer 1

To find the GCF of two numbers, you must first express them as their prime factors. In this case, that would be:

85 = 5x17

70 = 2x5x7

The next step would be to identify any common factors. In this case the only common factor is 5. Thus, the GCF of 85 and 70 is 5.

Answer 2

The GCF is 5.

Answer 3

Greatest common factor of 70 and 85 is 5.