ISEE Mathematics Achievement Question 243: Answer and Explanation

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Question: 243

4. Which of the following is NOT a multiple of 6 ?

  • A. 12
  • B. 18
  • C. 23
  • D. 24

Correct Answer: C

Explanation:

C The question asks which number is NOT a multiple of 6. 6 × 2 = 12 and 6 × 3 = 18, so (A) and (B) are multiples. 6 does not divide evenly into 23, so keep (C). 6 × 4 = 24 and 6 × 7 = 42 so (D) can be eliminated. The correct answer is (C).

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