ISEE Mathematics Achievement Question 241: Answer and Explanation

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Question: 241

2. If 12 is a factor of a certain number, what must also be factors of that number?

  • A. 2 and 6 only
  • B. 3 and 4 only
  • C. 12 only
  • D. 1, 2, 3, 4, and 6

Correct Answer: D

Explanation:

D Since 12 is a factor of a certain number, Plug In for that certain number. For instance, Plug In 36 since 12 is a factor, and use POE. 2 and 6 are factors of 36, but they are not the only factors of 36 listed in the choices. Eliminate (A). Similarly, 3 and 4 are not the only factors of 36 listed, so eliminate (B). 12 is a factor, but it is not the only factor listed, so eliminate (C). Choice (D) contains all the other factors listed in previous choices. The correct answer is (D).

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