The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 6.
The GCF is 1.
The GCF is 1.
13 is prime so in order for the GCF to be above 1, 13 would have to divide into 60. It does not, so the GCF is 1.
The GCF is 1.
GCF(60, 61) = 1. The GCF of any two consecutive non-zero integers is always 1.