Answer: The GCF of 28,42, and 56 is 14.
Explanation:
The multiples of 28 are:1,2,4,7,14,28
The multiples of 42 are:1,2,3,6,7,14,42
The multiples of 56 are:1,2,4,7,8,14,56
The greatest common factor they have is 14.
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