Since 7 is a factor of 42, it is automatically the GCF.
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7 (7X6=42 and 7X8=56)
The factors of 42 are:1, 2, 3, 6, 7, 14, 21, 42The factors of 56 are:1, 2, 4, 7, 8, 14, 28, 56The common factors are:1, 2, 7, 14The Greatest Common Factor:GCF = 14
The common factors are: 1, 2.
The factors of 28 are: 1, 2, 4, 7, 14, 28.The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56.The common factors are: 1, 2, 7, 14The greatest common factor is 14
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105 The common factors are: 1, 3, 7, 21 The Greatest Common Factor: GCF = 21