## Dawson4070 2 years ago Can anyone show me how to find the GCF of 72 and 78?

1. gdogthegirl
2. Dawson4070

Hello, thanks for responding to my question.

3. Dawson4070

Are you there?

4. Dawson4070

Hello and thanks for responding

5. nphuongsun93

$72 = 2 \times 2 \times 2 \times 3 \times3$$78 = 2 \times 3 \times 13$what factors do 72 and 78 have in common?

6. Dawson4070

2 and 3

7. nphuongsun93

so GCF = 2 * 3 ~

8. Dawson4070

Wowwww, so its the numbers 2 and 3, not just one of the numbers?

9. nphuongsun93

2 times 3 = 6 = gcf ~ 6 is the gcf

10. Dawson4070

So is 6 the GCF for both numbers

11. nphuongsun93

yes

12. Dawson4070

now that was a little confusing!! lol

13. nphuongsun93

72 can divide by 1, 2, 3, 4, 6, 8, 12, 18, 24, 36, 72 78 can divide by 1, 2, 3, 6, 13, 26, 39, 78. so 6 is the greatest common factors

14. nphuongsun93

the way i did earlier was |dw:1348610984777:dw|

15. Dawson4070

I got all your notes.. I have one more of these... GCF of 42 and 48.. I'm going to post this question. Maybe you will be able to come back.

16. nphuongsun93

we can do that here if you want ~ ur turn to write down factors of 42 and 48, or all the numbers they can divide

17. Dawson4070

when I add another question , it doesn't save the second question to my file/folder. I need to post the question, Give me a second.