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The factors of 308 are:
1, 2, 4, 7, 11, 14, 22, 28, 44, 77, 154, 308
The factors of 420 are:
1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
The common factors are:
1, 2, 4, 7, 14, 28
The Greatest Common Factor:
GCF = 28
The answer is 28.
The GCF is 28.
HCF(308, 420) = 28.
The GCF is 14.
The GCF is 4.
Since 210 is a factor of 420, it is automatically the GCF.
The GCF is 12.
The GCF is 35.
The GCF is 60.
The GCF is 84.