The factors of 14 are: 1, 2, 7, 14
The factors of 28 are: 1, 2, 4, 7, 14, 28
The factors of 35 are: 1, 5, 7, 35
The common factors are: 1, 7
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GCF(56, 28, 14) = 14.
To simplify 28 / 35, you divide by the GCF of 28 and 35. The GCF is 7, so 28 / 35 / 7 = 4 / 5.
The GCF is 14.
LCM = 70 GCF = 7
The GCF is 7.