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Primary 5 Maths: Triangle, Parallelogram and Trapezium Area — Practice Paper 3 (10 Questions)
Primary 5 Maths: Triangle, Parallelogram and Trapezium Area — Practice Paper 3 (10 Questions)
Paper 3 is built around which line is the height: a slant side is not a height, and cutting a corner away means rectangle minus triangle. Item 09 takes the area all the way to a price.
Quick answer 10 questions, about 25 minutes. Item 06 cuts a corner away, item 07 finds the missing parallel side and item 10 is the slant-side trap; mark after finishing.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 questions |
| Suggested time | 25 minutes |
| Difficulty mix | Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: Primary 5 Maths: Areas of Triangles, Parallelograms and Trapeziums |
| Level | Primary 5 |
02 Questions (10 items)
- FoundationA triangle has base 12 cm and height 7 cm. Find its area.
- FoundationA parallelogram has base 6.5 m and height 4 m. Find its area.
- FoundationA trapezium has parallel sides 9 cm and 15 cm and height 8 cm. Find its area.
- FoundationA triangle has area 96 cm² and base 12 cm. Find its height.
- IntermediateA parallelogram has area 84 m² and base 14 m. Find its height.
- IntermediateA 20 cm by 12 cm rectangle has a right-angled triangle (legs 8 cm and 9 cm) cut from one corner. Find the remaining area.
- IntermediateA trapezium has area 72 m², height 8 m and one parallel side 6 m. Find the other parallel side.
- ChallengeA triangular flower bed has base 25 m and height 16 m. One tree is planted every 4 m². How many trees?
- ChallengeA triangular cloth has base 1.2 m and height 0.8 m and costs 45 dollars per m². What is its price?
- Error redoA parallelogram has base 14 cm, slant side 10 cm and height 6 cm. Find its area. (common slip: using the slant side as the height and answering 140 cm²)
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 42 cm² | Base × height ÷ 2 = 12 × 7 ÷ 2. |
| 2 | 26.0 m² | No halving for a parallelogram: 6.5 × 4, keeping the decimal point. |
| 3 | 96 cm² | (9 + 15) × 8 ÷ 2; a trapezium needs ÷ 2 as well. |
| 4 | 16 cm | Reverse the formula: height = area × 2 ÷ base = 192 ÷ 12. |
| 5 | 6 m | No halving here, so simply 84 ÷ 14. |
| 6 | 204 cm² | Rectangle is 240 cm²; subtract the triangle 36 cm². |
| 7 | 12 m | Sum of the parallel sides = 72 × 2 ÷ 8 = 18, then subtract 6. |
| 8 | 50 trees | Area is 200 m², then divide by 4. |
| 9 | $21.6 | Area is 0.48 m², then × 45. |
| 10 | 84 cm² | The height must be perpendicular to the base, so not the slant side: 14 × 6. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.
