7 because:
7 x 4 = 28
7 x 6 = 42
7 x 14 = 98
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Greatest common factor of 42 and 28 is 14.
Factors of 28... 1,2,4,7,14,28 Factors of 42... 1,2,3,6,7,14,21,42 GCF = 14
The Greatest common factor is 14.
The greatest common factor of 28 and 42 is 7
The GCF is 14.