Factors of 8: 1, 2, 4, 8
Factors of 4: 1, 2, 4
Factors of 7: 1, 7
GCF (8, 4, 7) = 1
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The greatest common factor of 7 and 28 is 7.
The greatest common factor of 21 and 77 is 7.
The Greatest Common Factor of 35 and 14 is 7.
You can factor out a 7 making it 3 and 4.
the greatest common factor is 7