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Trade Mathematics Course: Estimating materials and costs

Quiz sa paksa na walang limitasyon sa oras: 15 tanong tungkol sa Estimating materials and costs, may paliwanag pagkatapos ng bawat sagot. Binabago ang ayos ng mga tanong at sagot sa bawat pagkakataon.

  • Kurso
  • Canada
  • 90 tanong
  • Sinuri noong Oktubre 13, 2026
  • Na-fact-check noong Oktubre 13, 2026
Magsimula sa mga aralinTrade Mathematics Course: Lessons: mga 240 minutong pagbasa. Saklaw ng mga aralin ang bawat tanong sa pagsusulit.

Quiz sa paksa 6: Estimating materials and costs

  1. Tanong 1 ng 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?
    Ipakita ang sagot

    Sagot: B. 10

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

  2. Tanong 2 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 3 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 4 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 5 ng 15

    You need 47 m of pipe. It is sold in 6 m lengths. How many lengths must you buy?
    Ipakita ang sagot

    Sagot: D. 8

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

  6. Tanong 6 ng 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?
    Ipakita ang sagot

    Sagot: C. 2

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

  7. Tanong 7 ng 15

    Three workers each work 7.5 hours at $34.50 an hour. What is the labour cost?
    Ipakita ang sagot

    Sagot: D. $776.25

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

  8. Tanong 8 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 9 ng 15

    You buy 19 sheets of plywood at $18.95 each. Which is the best quick estimate of the cost?
    Ipakita ang sagot

    Sagot: D. About $380

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

  10. Tanong 10 ng 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?
    Ipakita ang sagot

    Sagot: D. 3

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

  11. Tanong 11 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 12 ng 15

    A straight fence is 60 m long, with posts every 2.4 m, including one at each end. How many posts are needed?
    Ipakita ang sagot

    Sagot: C. 26

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

  13. Tanong 13 ng 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?
    Ipakita ang sagot

    Sagot: D. 55

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

  14. Tanong 14 ng 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?
    Ipakita ang sagot

    Sagot: 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. Tanong 15 ng 15

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

    Sagot: 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.