Respuesta :

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