ISEE Mathematics Achievement Question 256: Answer and Explanation
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Question: 256
2. How many factors do the integers 24 and 81 have in common?
- A. 1
- B. 2
- C. 3
- D. 4
Correct Answer: B
Explanation:
B First, list all the factors of 24: 1 and 24, 2 and 12, 3 and 8, 4 and 6. Next, list all the factors of 81: 1 and 81, 3 and 27, 9 and 9. The only factors that 24 and 81 have in common are 1 and 3, so there are two factors in common. The correct answer is (B).