What is the (GCF) of 4 and 7

The greatest common factor (GCF) of 4 and 7 is 1, because 1 is the only factor that they have in common.

what is the GCF of 8 and 12

The greatest common factor (GCF) of 8 and 12 is 4.

Here is how to find it:
- The factors of 8 are 1, 2, 4, 8
- The factors of 12 are 1, 2, 3, 4, 6, 12

The common factors of 8 and 12 are 1, 2, 4. The greatest common factor among these is 4.