0
Wiki User
The GCF is 6.
gcf of 6 and 18 is 6.
The GCF of 6, 16, 18 is 2.
6 is the GCF of 30 and 18.
42 / 18 = 2 r 6 18 / 6 = 3 r 0 -> gcf of 42 and 18 is 6.