Question

9 + 21 factor the expression using gcf

Answer 1

Both number are divisible by 3, so divide each by 3

3(3+7)

Answer 2

factors of 9:

1, 9, 3

factors of 21:

1, 21, 3, 7

3 is greatest Common factor.

Divide both numbers by three and put three outside the bracket


3(3+7)