How many acres are there in 1 square mile?

How many acres are there in 1 square mile?

• A. 320 acres
• B. 640 acres
• C. 160 acres
• D. 1280 acres

Answer: (B)

Think of measuring area by converting units. A square mile is the area 1 mile by 1 mile, and an acre is 43,560 square feet. Convert the square mile to square feet: 5,280 feet by 5,280 feet equals 27,878,400 square feet. Now divide by the number of square feet in an acre: 27,878,400 ÷ 43,560 = 640. So there are 640 acres in one square mile. This is a standard land-area relation; for example, a township of 6 by 6 miles is 36 square miles, or 23,040 acres.

Think of measuring area by converting units. A square mile is the area 1 mile by 1 mile, and an acre is 43,560 square feet. Convert the square mile to square feet: 5,280 feet by 5,280 feet equals 27,878,400 square feet. Now divide by the number of square feet in an acre: 27,878,400 ÷ 43,560 = 640. So there are 640 acres in one square mile. This is a standard land-area relation; for example, a township of 6 by 6 miles is 36 square miles, or 23,040 acres.