What is the greatest common factor of 28 and 60?

The GCF of 28 and 60 is 4.

To find the answer, you must find out their factors.

28:1, 2, 4, 7, 11, 28

60:1, 2, 3, 4, 5, 6, 10, 15, 20, 30, 60

As you can see, the greatest common factor of 28 and 60 is 4.