The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24
The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56
The common factors are: 1, 2, 4, 8
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There's not really any work to show. Since 28 is a factor of 56, it is automatically the GCF of this problem. That answer won't satisfy your teacher.
Factor them.
2 x 2 x 7 = 28
2 x 2 x 2 x 7 = 56
Select the common factors.
2 x 2 x 7 = 28, the GCF.
The GCF is 8.
The greatest common factor of 20, 24, and 56 are 4 .
The GCF is 8.
The GCF is 8.
The GCF is 8.