How many acres are in 1/2 square mile?

How many acres are in 1/2 square mile?

• A. 320 acres
• B. 640 acres
• C. 160 acres
• D. 480 acres

Answer: (A)

Understanding area units is key here: a square mile contains 640 acres. This comes from 1 mile equaling 5,280 feet, so a square mile is 5,280 by 5,280 feet, which is 27,878,400 square feet. Since an acre is 43,560 square feet, 27,878,400 ÷ 43,560 = 640 acres per square mile. Therefore, half a square mile is half of 640, which is 320 acres. The other options correspond to different fractions of a square mile: 640 is a full square mile, 160 is a quarter square mile, and 480 is three-quarters of a square mile.

Understanding area units is key here: a square mile contains 640 acres. This comes from 1 mile equaling 5,280 feet, so a square mile is 5,280 by 5,280 feet, which is 27,878,400 square feet. Since an acre is 43,560 square feet, 27,878,400 ÷ 43,560 = 640 acres per square mile. Therefore, half a square mile is half of 640, which is 320 acres. The other options correspond to different fractions of a square mile: 640 is a full square mile, 160 is a quarter square mile, and 480 is three-quarters of a square mile.