The factors of 630 are:
1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 30, 35, 42, 45, 63, 70, 90, 105, 126, 210, 315, 630
The factors of 735 are:
1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735
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Common factors of 420, 735, and 945 are: 1, 3, 5, 7, 15, 21, 35, and 105.
It is: 3*5*7^2 = 735
The easiest factor pairs are ( 1 x 630 ) and ( 10 x 63 ).
735
The prime factors of 630 are 2 x 3 x 3 x 5 x 7