ISEE Mathematics Achievement Question 86: Answer and Explanation
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Question: 86
2. Find the perimeter of a rectangle with the dimensions 115' × 63'.
- A. 7245'
- B. 356'
- C. 187'
- D. 178'
Correct Answer: B
Explanation:
The correct answer is (B). The perimeter is the sum of the lengths of the four sides. A rectangle has two pairs of sides of equal length. The perimeter then is (2 × 115) + (2 × 63) = 356 feet.
115 + 63 + 115 + 63 = 356
This is a good problem to solve by estimation. You can readily discard three of the possible answers without doing any calculation.