The greatest common factor of 20 and 90 is 10.
10 x 2 = 20
10 x 9 = 90
gcf(20, 30, 90) = 10
The GCF for 20 40 90 is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 10.
The GCF is 2.