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A bag of sand holds 1 cubic foot of sand. How many bags of sand are needed to fill a square sandbox measuring 5 feet long and 1 foot high?

A 25 bags

To find the volume of the sandbox, you take length times width times height (V=lwh). Don’t forget that the measurements are for a square sandbox, so you can assume that if the box is 5 feet long, then it’s also 5 feet wide. So 5 × 5 ×1 is 25 cubic feet. Each bag holds 1 cubic foot of sand, and 25 ÷ 1 = 25.