The factors of 315 are:
1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315
The factors of 378 are:
1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, 378
The common factors are:
1, 3, 7, 9, 21, 63
The Greatest Common Factor (GCF) is:
63
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315 = 32 x 5 x 7525 = 3 x 5 x 73 x 5 x 7 = 105 (GCF)
The GCF is 63.
The greatest common factor of 315 and 225 is 45.
The GCF is 35.
The GCF is 42.