List their prime factors: 14 = 2 x 7, 35 = 5 x 7.
The only common factor is 7
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The Greatest Common Factor of 14 and 21 is 7.
The greatest common factor (GCF) is: 14.
The Greatest Common Factor (GCF) is: 1
The greatest common factor of the numbers 14 and 30 is 2.
14