Very common factors don't exist. One factor cannot be more common than another. The GCF is 21.
The Greatest Common Factor of 28, 42, 63: 7
The highest common factor is 21
3The GCF is: 2121.The GCF is 21.
Answer: 7.
21
21
It is 21
The gcf is 21
It is: 3
The GCF is 21.
1 and 7
The greatest common factor is 21