The only factor that all of these numbers share is 1 since 3 and 5 are prime. So 1 is the gcf of this set of numbers.
The GCF is: 1
The GCF is 1.
The GCF is 2.
It is: 4
The GCF of consecutive integers is 1.
Gcf:36 lcm:12
The GCF is 2.
The GCF is 1.
The GCF is 2.
The greatest common factor (GCF) is 2.
15
20