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Convert the 4 inches into feet first. 4/12 = .33 feet. Now, compute the volume by multiplying the area of 64 square feet by .33 feet, and you get 21.12 cubic feet. Sometimes cement is ordered by the yard (cubic yard) and since there are 27 cubic feet in one cubic yard, you would divide 21.12 by 27 and get .78 yards.

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Q: How much cement for a 64 square feet 4 inches deep?
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