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30 questions from the trade math and blueprint reading practice test.
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10 questions, graded as you go, with the reason for every answer. No sign-up.
How many board feet are in one piece of 2 × 10 lumber that is 16 ft long? Use nominal sizes and round to one decimal place.
Answer in board feet.
26.7 board feet
Board feet = thickness (in) × width (in) × length (ft) ÷ 12 = 2 × 10 × 16 ÷ 12 = 320 ÷ 12 = 26.67, about 26.7 board feet.
Reference: Board feet = T (in) × W (in) × L (ft) ÷ 12
A framing order calls for 24 pieces of 2 × 8 lumber, each 12 ft long. How many board feet is that, using nominal sizes?
C. 384 board feet
One piece: 2 × 8 × 12 ÷ 12 = 16 board feet. 24 pieces: 24 × 16 = 384 board feet. 288 is linear feet, and 4,608 leaves out the division by 12.
Reference: Board feet = pieces × T (in) × W (in) × L (ft) ÷ 12
A slab is 30 ft × 40 ft and 5 in thick. Allowing 10% for waste, how many cubic yards of concrete are needed? Round to one decimal place.
Answer in cu yd.
20.4 cu yd
Volume: 30 × 40 × (5 ÷ 12) = 500 cu ft. Cubic yards: 500 ÷ 27 = 18.52. With 10% waste: 18.52 × 1.10 = 20.37, about 20.4 cu yd.
Reference: Concrete: cu yd = L × W × T (ft) ÷ 27, × (1 + waste)