How do you find the gcf of 12 and 42?

Answer 1

you can see that both are even, so 2 will go in and you get 6 and 21. with 6 and 21, 2 won't go in, but another 3 will, giving you 2 and 7. You then can't go any further. so you got a division by 2 and then by 3 so multiply these and you get 6, your highest common factor