You need at least two numbers to find a GCF.
The gcf of 12 and 118 is 2.
The GCF is 1.
The GCF is 2.
The GCF is 2.
The GCF is 1.
The GCF is 10.
The GCF is 5.
It is: 1
The GCF of 137 and 230 is 1. 137 is prime, and so its only factors are 1 and 137. Since 137 is not a factor of 230, the GCF of 137 and 230 is 1.
The GCF of 60 and 118 is 2.
10