You need at least two numbers to find a GCF.
There is no such thing as the GCF of one single number. Only two or more numbers.
The GCF is 2.
The GCF is 6.
The GCF is 26.
The GCF is 3.
The GCF is 3.
The GCF is 2.
The GCF is 1.
The GCF is 2.
The GCF of 78 and 30 is 6.
The GCF is 26.
what is the gcf of 78 and 56
gcf(100, 78) = 2