The prime factorizations of 16 and 24 are as follows: Prime factorization of 16 : 2 , 2 , 2 , 2 Prime factorization of 24 : 2 , 2 , 2 , 3 Using the prime factorizations, which is the greatest common factor of 16 and 24 ?

The prime factors shared by 16 and 24 are three 2s: 16 = 2 × 2 × 2 × 2, while 24 = 2 × 2 × 2 × 3. Their greatest common factor is the product of those shared factors, 2 × 2 × 2 = 8. Therefore, choice A, “2 times 2 times 2,” is correct.

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