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Trade Mathematics Course: Estimating materials and costs

Themenquiz ohne Zeitlimit: 15 Fragen zu Estimating materials and costs, mit einer Erklärung nach jeder Antwort. Fragen und Antworten werden jedes Mal neu gemischt.

  • Kurs
  • Kanada
  • 90 Fragen
  • Geprüft am 13. Oktober 2026
  • Faktengeprüft am 13. Oktober 2026
Beginnen Sie mit den LektionenTrade Mathematics Course: Lessons: etwa 240 Minuten Lesezeit. Jede Testfrage wird in den Lektionen behandelt.

Themenquiz 6: Estimating materials and costs

  1. Frage 1 von 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?
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    Antwort: B. 10

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

  2. Frage 2 von 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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    Antwort: 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. Frage 3 von 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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    Antwort: 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. Frage 4 von 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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    Antwort: 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. Frage 5 von 15

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

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

  6. Frage 6 von 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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    Antwort: C. 2

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

  7. Frage 7 von 15

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

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

  8. Frage 8 von 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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    Antwort: 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. Frage 9 von 15

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

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

  10. Frage 10 von 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?
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    Antwort: D. 3

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

  11. Frage 11 von 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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    Antwort: 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. Frage 12 von 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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    Antwort: C. 26

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

  13. Frage 13 von 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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    Antwort: D. 55

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

  14. Frage 14 von 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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    Antwort: 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. Frage 15 von 15

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