Worksheet generator

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Math Kangaroo practice

Name: ______________________Date: ____________3 questions · 9 points

1.A bread recipe uses flour and sugar in the ratio 5 to 3. The two together weigh 320 grams. How much of that is flour?[3]
- A120 g
- B160 g
- C200 g
- D192 g
- E64 g
2.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
3.A jacket costs 80 pounds. In January the price rises by 20 percent. In February the new price falls by 20 percent. What is the price at the end of February?[3]
- A80 pounds
- B76.80 pounds
- C64 pounds
- D83.20 pounds
- E96 pounds

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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 — 200 gKA-0151Ratio as parts of a whole
- AI worked out the part size correctly and then answered for the sugar instead of the flour.
- BI split the 320 grams into two halves instead of into eight equal parts.
- DI took three fifths of 320 rather than five eighths, using the ratio numbers as a fraction of each other.
- EI divided 320 by the 5 in the ratio and stopped, treating 5 as the number of parts.
2.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.
3.B — 76.80 poundsKA-0153Percentages and simple discounts
- AI assumed a 20 percent rise and a 20 percent fall must cancel because the percentages match.
- CI applied only the fall and forgot the rise.
- DI got the size of the change right but the direction wrong.
- EI applied only the rise and forgot the fall.

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