It's not necessary. Since 69 is a factor of 207, it is automatically the GCF. But if you insist...
69
3,23
207
3,69
3,3,23
Select the common factors.
3 x 23 = 69, the GCF.
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it is 9.
it is 14
It is 5
Greatest Prime Factor of 70The prime factorization of 70 is 2 X 5 X 7, so the greatest prime factor in the prime factorization of 70 is 7.
The prime factorization of 9 is 3*3. The prime factorization of 112 is 2*2*2*2*7. Therefore, they have no common factors, except for 1.