How many acres are in a square mile?

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Multiple Choice

How many acres are in a square mile?

Explanation:
Area units come from how big a land area is in square feet. An acre is defined as 43,560 square feet, and a mile is 5,280 feet long. A square mile uses sides of 5,280 feet, so its area is 5,280 × 5,280 = 27,878,400 square feet. Dividing by 43,560 square feet per acre gives 27,878,400 ÷ 43,560 = 640. So there are 640 acres in a square mile.

Area units come from how big a land area is in square feet. An acre is defined as 43,560 square feet, and a mile is 5,280 feet long. A square mile uses sides of 5,280 feet, so its area is 5,280 × 5,280 = 27,878,400 square feet. Dividing by 43,560 square feet per acre gives 27,878,400 ÷ 43,560 = 640. So there are 640 acres in a square mile.

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