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Trade Mathematics Course: Estimating materials and costs

Quiz tematico senza limite di tempo: 15 domande su Estimating materials and costs, con una spiegazione dopo ogni risposta. Domande e risposte vengono mescolate ogni volta.

  • Corso
  • Canada
  • 90 domande
  • Verificato: 13 ottobre 2026
  • Verificato il 13 ottobre 2026
Inizia dalle lezioniTrade Mathematics Course: Lessons: circa 240 minuti di lettura. Ogni domanda del test è trattata nelle lezioni.

Quiz tematico 6: Estimating materials and costs

  1. Domanda 1 di 15

    A 12 ft wall gets studs every 16 in on centre, plus one at the far end. Ignoring extra studs for corners and openings, how many studs do you need?
    Mostra la risposta

    Risposta: B. 10

    12 ft = 144 in. 144 ÷ 16 = 9 spaces. You need one more stud than spaces: 9 + 1 = 10.

  2. Domanda 2 di 15

    A room is 14 ft by 9 ft with 8 ft walls. Drywall sheets are 4 ft by 8 ft. Ignoring openings and waste, how many sheets do the walls need?
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    Risposta: D. 12

    Wall area = 2 × (14 + 9) × 8 = 368 ft². Each sheet is 32 ft². 368 ÷ 32 = 11.5, so round up to 12 sheets.

  3. Domanda 3 di 15

    A floor is 3.6 m by 2.4 m. Each box of tile covers 1.44 m². You add 10% for waste. How many boxes do you buy?
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    Risposta: C. 7

    Area = 3.6 × 2.4 = 8.64 m². With waste: 8.64 × 1.10 = 9.504 m². 9.504 ÷ 1.44 = 6.6, so buy 7 boxes.

  4. Domanda 4 di 15

    You need 4 cable runs. Each run is 17.5 m, and you allow 2 m extra per run for connections. You have one 75 m spool. Is it enough?
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    Risposta: C. No, it is 3 m short

    Each run needs 17.5 + 2 = 19.5 m. 4 × 19.5 = 78 m, and 78 − 75 = 3 m short.

  5. Domanda 5 di 15

    You need 47 m of pipe. It is sold in 6 m lengths. How many lengths must you buy?
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    Risposta: D. 8

    47 ÷ 6 = 7.83. You cannot buy part of a length, so round up to 8.

  6. Domanda 6 di 15

    Your estimate is that each metre of weld uses 0.35 kg of wire. The job has 64 m of welds, and wire comes on 15 kg spools. How many spools do you need?
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    Risposta: C. 2

    Wire needed = 64 × 0.35 = 22.4 kg. 22.4 ÷ 15 = 1.49, so round up to 2 spools.

  7. Domanda 7 di 15

    Three workers each work 7.5 hours at $34.50 an hour. What is the labour cost?
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    Risposta: D. $776.25

    Total hours = 3 × 7.5 = 22.5. Cost = 22.5 × 34.50 = $776.25.

  8. Domanda 8 di 15

    A job has $1,840 in materials and 26 hours of labour at $68 an hour. 5% GST is added to the whole subtotal. What is the total?
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    Risposta: A. $3,788.40

    Labour = 26 × 68 = 1,768. Subtotal = 1,840 + 1,768 = 3,608. Total = 3,608 × 1.05 = $3,788.40.

  9. Domanda 9 di 15

    You buy 19 sheets of plywood at $18.95 each. Which is the best quick estimate of the cost?
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    Risposta: D. About $380

    Round to easy numbers: 19 ≈ 20 and $18.95 ≈ $19. 20 × 19 = $380. (The exact cost is $360.05.)

  10. Domanda 10 di 15

    Walls with an area of 43.2 m² need two coats of paint. One litre covers 10 m², and paint comes in 4 L cans. How many cans do you buy?
    Mostra la risposta

    Risposta: D. 3

    Paint needed = 43.2 × 2 ÷ 10 = 8.64 L. 8.64 ÷ 4 = 2.16 cans, so round up to 3.

  11. Domanda 11 di 15

    A slab needs 2.4 m³ of concrete. You add 5% for spillage and uneven ground, and the supplier sells in steps of 0.25 m³. What should you order?
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    Risposta: A. 2.75 m³

    2.4 × 1.05 = 2.52 m³. The next 0.25 m³ step above 2.52 is 2.75 m³. Ordering 2.50 m³ would leave you short.

  12. Domanda 12 di 15

    A straight fence is 60 m long, with posts every 2.4 m, including one at each end. How many posts are needed?
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    Risposta: C. 26

    60 ÷ 2.4 = 25 spaces. Posts = spaces + 1 = 26.

  13. Domanda 13 di 15

    A roof is 1,650 ft². One roofing square covers 100 ft², the shingles you use need 3 bundles per square, and you add 10% for waste. How many bundles do you buy?
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    Risposta: D. 55

    1,650 × 1.10 = 1,815 ft² = 18.15 squares. 18.15 × 3 = 54.45, so round up to 55 bundles.

  14. Domanda 14 di 15

    Rebar runs across a slab 4 m wide, spaced no more than 300 mm apart, with a bar at each edge. How many bars do you need?
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    Risposta: A. 15

    4,000 ÷ 300 = 13.3 spaces. Round up to 14 spaces so no gap is over 300 mm. Bars = 14 + 1 = 15.

  15. Domanda 15 di 15

    A 50 m roll of wire costs $62 and a 75 m roll costs $89. Which is cheaper per metre?
    Mostra la risposta

    Risposta: A. The 75 m roll, by about 5 cents a metre

    Price per metre: 62 ÷ 50 = $1.24 and 89 ÷ 75 = $1.19. The 75 m roll is about $0.05 a metre cheaper.