The GCF of 42 49 and 81 is 1. There are no common factors aside from 1. If you meant 4249 and 81, then it is still 1.
gcf of 37 and 81 is 1.
The GCF of 27 and 81 is 27. And their LCM is 81.
The GCF is 9.
The GCF is 1.
The GCF is 27.
The GCF is 27.
The GCF is 9.
The GCF is 1.
The GCF is 2.
The GCF of 6 and 81 is 3.
The GCF is 9.
The GCF is 9.