What is the gcf of 45, 18, and 39?

The Gcf of 45,18 and 39 is 3

The GCF is the greatest common factor that go into the three numbers 45, 18 and 39,

3 into 45 is 15

3 into 18 is 6

3 into 39 is 13

There is no other number that can go simultaneously into 15, 6 and 13.

So the GCF of 45, 18 and 39 is 3.