The prime factorization of 245 is 5 x 7 x 7
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The prime factorization for 490 is 7x7x5x2= 490, or 7 to the power of 2 x 5x2
1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490 2, 5 and 7 are prime.
Since 70 is a factor of 490, it is automatically the GCF.
490 = 2 x 5 x 72
The greatest common factor of 490 and 816 is 2.