It is: 6
4
15 is the GCF
The GCF is 4.
The GCF is 6.
The greatest factor of 60 is 60.
The GCF of 18, 42 and 60 is 6.
The GCF of 42, 30, and 60 is 6.
6
It is 6
The GCF is 6.
The least common factor of any set of positive integers is 1.
The greatest common factor is 6