What is the GCF of 5a and 7c?

To get the Greates Common Factor (GCF) of 5 and 7 we need to factor each value first and then we choose all the copies of factors and multiply them:

5: 5 7: 7 GCF:

The Greates Common Factor (GCF) is: 1

1 is yourgrates common factor for each number