Grade 8Mathpractice16 questions

Proportion and speed

Grade 8: direct proportion, unitary method, best buy comparisons, speed = distance / time, units of speed.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

  1. If 3 pens cost $6 and the price is in direct proportion, how much do 5 pens cost?

    • $10
    • $12
    • $15
    • $8
    Show answer$10

  2. If two quantities are in direct proportion, doubling one doubles the other. (True or false?)

    Show answerTrue

  3. A recipe uses 200 g flour for 4 people. How much flour for 10 people?

    • 450 g
    • 500 g
    • 550 g
    • 800 g
    Show answer500 g

  4. Which pair of values is in direct proportion?

    • 1 : 3 and 4 : 10
    • 1 : 3 and 4 : 12
    • 2 : 5 and 4 : 9
    • 3 : 6 and 5 : 9
    Show answer1 : 3 and 4 : 12

  5. 8 notebooks cost $24. Using the unitary method, what is the cost of one notebook?

    • $16
    • $2
    • $3
    • $4
    Show answer$3

  6. 7 identical apples weigh 560 g. What do 12 apples weigh, in grams? (Answer out loud)

    Show answer960 g

  7. Which is the better buy? A: 5 kg for $10. B: 3 kg for $7.50.

    • A
    • B
    • Both are the same
    • Cannot tell
    Show answerA

  8. Juice: 500 ml costs $1.20 and 2 litres costs $4.00. Which is cheaper per litre?

    • Cannot tell
    • The 2 litre bottle
    • The 500 ml bottle
    • They cost the same
    Show answerThe 2 litre bottle

  9. A car travels 150 km in 3 hours. What is its average speed?

    • 153 km/h
    • 30 km/h
    • 450 km/h
    • 50 km/h
    Show answer50 km/h

  10. A cyclist riding at 12 km/h for 2.5 hours travels 30 km. (True or false?)

    Show answerTrue

  11. A train goes at 80 km/h. How long does it take to travel 200 km?

    • 16 hours
    • 2 hours
    • 2.5 hours
    • 3 hours
    Show answer2.5 hours

  12. A runner covers 600 m in 2 minutes. What is her speed in metres per minute? (Answer out loud)

    Show answer300 m/min

  13. Which unit is most suitable for the speed of a snail?

    • cm per minute
    • kg per hour
    • km per hour
    • m per second squared
    Show answercm per minute

  14. A speed of 36 km/h is the same as 20 m/s. (True or false?)

    Show answerFalse

  15. Convert 10 m/s into km/h.

    • 10 km/h
    • 100 km/h
    • 3.6 km/h
    • 36 km/h
    Show answer36 km/h

  16. A bus drives 45 km in 45 minutes. What is its speed in km/h? (Answer out loud)

    Show answer60 km/h

Play it as a game

Penalty KickAnswer right to take a penalty: left or right for 2, the top corner for 3. Will the keeper save it?Fishing PondAnswer right to cast at a buoy: fish worth 1 to 3, the golden fish for 5, or a silly old boot!Claw MachineAnswer right to work the claw: grab a plush prize, but the big ones slip more often!Lucky DropAnswer right to drop a ball through the pegs. Every bucket scores, and the golden one is worth 10!

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