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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2 on the sheet, 2 match these filtersReshuffle Start overseed 5

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Math Kangaroo practice

Name: ______________________Date: ____________2 questions · 7 points

1.In a triangle, one angle measures 30 degrees. Of the other two angles, one is exactly twice the other. What is the largest angle in the triangle?[3]
- A50 degrees
- B75 degrees
- C100 degrees
- D150 degrees
- E90 degrees
2.A photograph measures 8 cm by 12 cm. It is enlarged so that the shorter side becomes 20 cm, and the shape is not distorted. How long is the longer side of the enlargement?[4]
- A24 cm
- B30 cm
- C32 cm
- D4.8 cm
- E18 cm

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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.C — 100 degreesKA-0152Angles on lines, in triangles, in polygons
- AI found the smaller of the two unknown angles and stopped before doubling it.
- BI split the remaining 150 degrees into two equal halves instead of a one-to-two split.
- DI split the remainder evenly into 75 and 75, then doubled one of them.
- EI assumed that the largest angle in a triangle like this must be a right angle.
2.B — 30 cmKA-0155Scaling and similar figures
- AI kept the difference of 4 cm between the two sides instead of keeping their ratio.
- CI added 20 to 12 rather than scaling 12.
- DI used the scale factor upside down and multiplied 12 by 8/20 instead of 20/8.
- EI multiplied 12 by 1.5, the ratio between the original sides, instead of by the enlargement factor.

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