10,890 sq feet.
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10,890 square feet.
To calculate the number of 25 by 100 feet lots needed to make an acre, we first convert an acre to square feet, which is 43,560 square feet. Then, we divide the total square footage of an acre by the area of one lot (25 feet by 100 feet = 2,500 square feet) to find the number of lots. Therefore, 43,560 square feet divided by 2,500 square feet equals 17.424. This means you would need 18 lots of 25 by 100 feet to make an acre, with a small remainder.
25 acres = 1,089,000ft²
An acre contains 43,560 square feet. The conversion says that it would be .25 of an acre, or a quarter of an acre.
1 acre = 43560 sq feet.