What is the Greatest Common Factor of:

24, 36

What is the Greatest Common Factor of:

30, 40

What is the Greatest Common Factor of:

20, 24

What is the Greatest Common Factor of:

10, 20

What is the Greatest Common Factor of:

10, 15

What is the Greatest Common Factor of:

28, 36

What is the Greatest Common Factor of:

6, 21

What is the Greatest Common Factor of:

24, 72

What is the Greatest Common Factor of:

30, 48

What is the Greatest Common Factor of:

16, 20

What is the Greatest Common Factor of:

8, 12

What is the Greatest Common Factor of:

16, 24

What is the Greatest Common Factor of:

10, 18

What is the Greatest Common Factor of:

9, 24

What is the Greatest Common Factor of:

9, 15