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Primary 5 Maths: Area of Triangles, Parallelograms and Trapeziums — 10 Practice Questions with Answers
Primary 5 Maths: Area of Triangles, Parallelograms and Trapeziums — 10 Practice Questions with Answers
Three area formulas get mixed up easily: a triangle needs ÷ 2, a parallelogram does not, and a trapezium is (a + b) × h ÷ 2. These ten items deliberately mix them so the pupil names the formula first every time.
Quick answer 10 questions, about 25 minutes. Items 04 to 07 work backwards to a base or height and cause the most lost marks; mark only 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 8 cm and height 5 cm. Find its area.
- FoundationA parallelogram has base 12 m and height 7 m. Find its area.
- FoundationA trapezium has parallel sides 6 cm and 10 cm, height 4 cm. Find its area.
- FoundationA triangle has area 36 cm² and base 9 cm. Find its height.
- IntermediateA parallelogram has area 96 m² and base 12 m. Find its height.
- IntermediateA trapezium has parallel sides 5 m and 9 m and area 42 m². Find its height.
- IntermediateA triangle has base 1.2 m and height 0.8 m. Find its area.
- ChallengeA triangle and a parallelogram share the same base and height. What fraction of the parallelogram is the triangle?
- ChallengeA trapezium flower bed has parallel sides 4 m and 6 m and height 5 m. Three plants are grown per m². How many plants in total?
- Error redoA triangle has base 15 cm and height 6 cm. Find its area. (common slip: forgetting ÷ 2 and answering 90 cm²)
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 20 cm² | Base × height ÷ 2 = 8 × 5 ÷ 2. |
| 2 | 84 m² | For a parallelogram, no halving: base × height. |
| 3 | 32 cm² | (a + b) × h ÷ 2 = 16 × 4 ÷ 2. |
| 4 | 8 cm | Reverse the formula: area × 2 ÷ base. |
| 5 | 8 m | Height = area ÷ base; do not double. |
| 6 | 6 m | Height = area × 2 ÷ (a + b) = 84 ÷ 14. |
| 7 | 0.48 m² | Work with decimals: 1.2 × 0.8 = 0.96, then ÷ 2. |
| 8 | 1/2 | The triangle formula has an extra ÷ 2, so it is exactly half. |
| 9 | 75 plants | Area is 25 m², then × 3. |
| 10 | 45 cm² | 15 × 6 = 90 is the parallelogram; a triangle needs one more ÷ 2. |
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.
