Question

What is the GCF of 15 and 30

Answer 1

The Greatest Common Factor (GCF) is to look for the biggest number that is simultaneously divisible into 15 and 30.

3    /       15      30

5    /       5        10

        /     1         2

GCF = 3 * 5 = 15.

The greatest common factor = 15.

I hope this explains it.

Answer 2

15 is the GCF of 15 and 30, as 15 is the largest factor of 15 and 30.