The GCF is 3.
The GCF is 15.
You need at least two numbers to find a GCF.
The GCF is 3.
The GCF of 18 and 42 is 6. The GCF of 42 and 56 is 14.
The GCF of 42 and 51 is 3.
gcf(15, 42) = 3.
1
The GCF is 3.
3
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 15.
The answer is 3