Question

The expression 9+21 factored using GCF is?

Answer 1

Rewrite and factor 9 and 21;

3•3+3•7= 3(3+7)

GCF for 9 and 21 is 3

Answer 2

GCF is 3 because 3 times 3 is 9 and 3 times 7 is 21.