For an inch-pound calculation, a concrete slab 6 in thick, 200 ft long, and 100 ft wide with a 10% waste factor requires approximately how many cubic yards?

For an inch-pound calculation, a concrete slab 6 in thick, 200 ft long, and 100 ft wide with a 10% waste factor requires approximately how many cubic yards?

• A. 403.6
• B. 407.41
• C. 412.2
• D. 395.0

Answer: (B)

Calculate the concrete volume in cubic feet, then convert to cubic yards and include the waste factor. The slab thickness is 6 inches, which is 0.5 feet. So the base volume is 200 ft × 100 ft × 0.5 ft = 10,000 ft³. With a 10% waste factor, multiply by 1.10 to get 11,000 ft³. Convert to cubic yards using 1 yd³ = 27 ft³: 11,000 ÷ 27 ≈ 407.41 yd³. The approximate amount required is 407.41 cubic yards.

Calculate the concrete volume in cubic feet, then convert to cubic yards and include the waste factor. The slab thickness is 6 inches, which is 0.5 feet. So the base volume is 200 ft × 100 ft × 0.5 ft = 10,000 ft³. With a 10% waste factor, multiply by 1.10 to get 11,000 ft³. Convert to cubic yards using 1 yd³ = 27 ft³: 11,000 ÷ 27 ≈ 407.41 yd³. The approximate amount required is 407.41 cubic yards.