You are installing a granite countertop that has a length of 8 feet and a width of 18 inches. To determine the amount of granite you need in square feet, you write the calculation (8)(18) = 144 square feet. Is this correct?
Answer
A
Yes, it is correct.
B
The calculation is correct but the units are not. It should be 144 feet.
C
No, convert inches to feet first and add to get 8 + 1.5 = 9.5 square feet.
D
No, convert feet to inches first to get (96)(18) = 1,728 square inches.
E
No, convert inches to feet first to get (8)(1.5) = 12 square feet.
Explanation
To find the countertop’s area in square feet, both dimensions must be in feet. Convert 18 inches to feet: 18 ÷ 12 = 1.5 feet, then multiply 8 × 1.5 = 12 square feet. So the correct choice is E, converting inches to feet before calculating.
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