What is the greatest common factor of 45 and 56's prime numbers?

Answer 1

3 x 3 x 5 = 45

2 x 2 x 2 x 7 = 56

Since 45 and 56 don't have any prime factors in common, the GCF is 1.

Answer 2

3 x 3 x 5 = 45

2 x 2 x 2 x 7 = 56

No common prime factors; the GCF is 1.

Answer 3

GCF(45, 56) = 1. The numbers are co-prime.