Answer:
8
Explanation:
Factors of 40: 1 2 4 5 8 10 20 40
Factors of 56: 1 2 4 8 14 28 56
Common factors: 1 2 4 8
Greatest common factor: 8
Prime factorization
40 = 2 x 2 x 2 x 5
56 = 2 x 2 x 2 x 7 common factor 2 x 2 x 2 = 8
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