First, you need to list the factors of all the numbers.
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Factors of 96: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
Then, find the greatest factor they have in common. In this case, it's 8.
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