What is the greatest common factor of 45 and 15?

Answer 1

The GCF of 15 and 45 is 15

Since 15 is a factor of 45, and 15's largest factor cannot be larger than itself, the greatest common factor of 15 and 45 is 15.
Since 15 is a factor of 45, it is automatically the GCF.
15

Answer 2

15 15 divides into 45 evenly, so 15 is the answer◄

Answer 3

The GCF is 15.