ISEE Mathematics Achievement Question 215: Answer and Explanation

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Test Information

Question: 215

10. Which if the following is divisible only by itself and 1?

  • A. 61
  • B. 81
  • C. 171
  • D. 207

Correct Answer: A

Explanation:

A is correct. 61 is divisible only by itself and 1. 81 ÷ 9 = 9; 171 ÷ 9 = 19; 207 ÷ 9 = 23.

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