What is the gcf of 49 9?

Answer 1

49-?=9

Answer 2

GCF - Greatest Common Factor.

The factors (integers that multiply to make) of 49 are 1 * 49, 7 * 7

Factors of 9 are 1 * 9, 3 * 3.

Which factors do both numbers have in common? ... Just 1.

This means the GCF of 49 & 9 is 1. IN fact, it's the ONLY common factor of 49 & 9, not just the greatest.

Try this one on your own:

GCF of 25 and 75.

Hint: Factors of 25 -- 1, 25. 5, 5.

Hint: Factors of 50 -- 1, 50. 2, 25. 5, 10.

Which factors of 25 and 50 are in common?

Of these common factors, which is the greatest? (GCF)