140 = 2 * 2 * 5 * 7
700 = 2 * 2 * 5 * 5 * 7
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The Prime Factorization for 70 is 7 x 5 x 2
2 x 5 x 7 = 70
10, 20, 30, 40, 50, 60, 70, 80, 90
The GCF of 15 and 70 is 5.The prime factorization of 15 is 3*5.The prime factorization of 70 is 2*5*7.The only, and greatest, common factor is 5.The GCF is 5.
Looks like 70, 490 = 7 x 70, 630 = 9 x 70 and 7 and 9 are co-prime.