ISEE Mathematics Achievement Question 5: Answer and Explanation

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Question: 5

5. If x is an even integer, then which of the following CANNOT be an integer?

  • A. x – 2
  • B. 2x + 3
  • C.
  • D.

Correct Answer: C

Explanation:

C

Choice (C) cannot be an integer because an even integer times any integer is even and that result plus an odd integer is odd. An odd number divided by 2 is not an integer.

Plug in an acceptable value for x, such as x = 4. Only choice (C) yields a non-integer when you test in 4.

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