ISEE Mathematics Achievement Question 299: Answer and Explanation

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Question: 299

1. During a severe winter in Ontario, the temperature dropped suddenly to 10 degrees below zero. If the temperature in Ontario before this cold spell occurred was 10 degrees above zero, by what percent did the temperature drop?

  • A. 50%
  • B. 100%
  • C. 150%
  • D. 200%

Correct Answer: D

Explanation:

D The question is testing percent change since it asks by what percent did the temperature drop? To find percent change, use this formula: % change = × 100. The change in temperature was 20°: 10° - (-10°) = 20°. Since the question asks for the percent the temperature dropped, the larger number will be the original number. Thus, the equation should read × 100, which reduces to 2 × 100 = 200. The correct answer is (D).

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