How much concrete is needed to make a 3 slab 4ft long and 2 ft wide?

Answer 1

(4-ft x 2-ft x 3-in) = (4-ft x 2-ft x 1/4 ft) = (2 cubic feet) / (27 cubic feet per cubic yard) = 0.0741 yard3 (rounded)

If the "3" in the question was supposed to be a thickness of 3-ft instead of 3 inches, then

(4-ft x 2-ft x 3-ft) = (24 cubic feet) / (27 cubic feet per cubic yard) = (8/9) = 0.889 yard3 (rounded)

Either way, expect to pay for a whole yard, or whatever the minimum delivery is.