answersLogoWhite

0

3
To find the GCF of two or more numbers you can find the factor pairs of each number and then find the factors they have in common.

9:

1 x 9

3 x 3

21:

1 x 21

3 x 7

The GCF of 9 and 21 is 3.

User Avatar

Wiki User

11y ago

What else can I help you with?