Worksheet generator

Pick what you want, print the page. The answer key comes with it, on its own sheet, and it tells you the mistake behind every wrong choice — not just which letter is right.

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Math Kangaroo practice

Name: ______________________Date: ____________1 questions · 4 points

1.A driver travels from one town to another at an average of 60 km/h and returns along the same road at an average of 40 km/h. What is the average speed for the whole journey?[4]
- A48 km/h
- B50 km/h
- C52 km/h
- D24 km/h
- E100 km/h

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Answer key — Math Kangaroo practice

Each wrong choice carries the thinking that produces it. When a student picks C, this is what they were doing.

1.A — 48 km/hKA-0174Rate, time, distance
- BI averaged the two speeds, which would only be right if equal TIME were spent at each, not equal distance.
- CI weighted the two speeds by their own values instead of by the time each leg took.
- DI halved the correct answer, dividing by the total distance twice.
- EI added the two speeds together, which gives a number faster than either leg and so cannot be an average of them.

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