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Verified Answer :

these are the prime factorization for 24, 40, and 56

24: 2 2  2 3
40: 2
2 2 5
56: 2 2 2 * 7

the highest number that goes into all three of these numbers is 2

The Greatest Common factor (GCF) of 24,40, and 56 is 8, because 8 is the common factor that comes in those numbers.