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Trade Mathematics Course: Estimating materials and costs

Quiz thématique sans limite de temps : 15 questions sur Estimating materials and costs, avec une explication après chaque réponse. Les questions et les réponses sont mélangées à chaque fois.

  • Formation
  • Canada
  • 90 questions
  • Vérifié le 13 octobre 2026
  • Vérifié (faits) le 13 octobre 2026
Commencez par les leçonsTrade Mathematics Course: Lessons : environ 240 minutes de lecture. Chaque question du test est traitée dans les leçons.

Quiz thématique 6 : Estimating materials and costs

  1. Question 1 sur 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?
    Voir la réponse

    Réponse: B. 10

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

  2. Question 2 sur 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?
    Voir la réponse

    Réponse: 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. Question 3 sur 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?
    Voir la réponse

    Réponse: 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. Question 4 sur 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?
    Voir la réponse

    Réponse: 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. Question 5 sur 15

    You need 47 m of pipe. It is sold in 6 m lengths. How many lengths must you buy?
    Voir la réponse

    Réponse: D. 8

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

  6. Question 6 sur 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?
    Voir la réponse

    Réponse: C. 2

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

  7. Question 7 sur 15

    Three workers each work 7.5 hours at $34.50 an hour. What is the labour cost?
    Voir la réponse

    Réponse: D. $776.25

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

  8. Question 8 sur 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?
    Voir la réponse

    Réponse: 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. Question 9 sur 15

    You buy 19 sheets of plywood at $18.95 each. Which is the best quick estimate of the cost?
    Voir la réponse

    Réponse: D. About $380

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

  10. Question 10 sur 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?
    Voir la réponse

    Réponse: D. 3

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

  11. Question 11 sur 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?
    Voir la réponse

    Réponse: 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. Question 12 sur 15

    A straight fence is 60 m long, with posts every 2.4 m, including one at each end. How many posts are needed?
    Voir la réponse

    Réponse: C. 26

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

  13. Question 13 sur 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?
    Voir la réponse

    Réponse: D. 55

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

  14. Question 14 sur 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?
    Voir la réponse

    Réponse: 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. Question 15 sur 15

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

    Réponse: 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.