1
They are both prime numbers.
The GCF is 1.
gcf of 37 and 81 is 1.
You need at least two numbers to find a GCF. If that's 3 and 7, the GCF is 1.
The GCF is 31.
The GCF is 37.
The GCF is 37.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
-56
The GCF is 31.