Factor them both.
2 x 5 x 7 x 7 = 490
2 x 2 x 2 x 5 x 7 + 280
Find the factors in common.
2 x 5 x 7 = 70, the HCF
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Whatever equals 35.
greatest common factor of 56 280 and 400 is 8.
The greatest common factor of 70 147 175 and 280 is 7.
The Greatest Common Factor (GCF) is: 20.
The greatest common factor (GCF) is: 20