1
13, 23 & 37 are all prime numbers which means that their factors are 1 and themselves only.
Thus, their common factor is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The greatest common factor of 208 and 273 is 13.
1 is the only even common factor of 13 and 37.
The GCF is 1.
The GCF is 1.
gcf of 37 and 81 is 1.
The GCF is 37.
The GCF is 37.
The GCF is 1.
The GCF is 1.