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Primary 3 Maths: Perimeter and Length — Practice Paper 1 (10 Questions)
Primary 3 Maths: Perimeter and Length — Practice Paper 1 (10 Questions)
Paper 1 starts from the walk around: a rectangle and a square first, then metres and centimetres, then working backwards from a perimeter to a side and to a width. The last three items cover a corner cut that changes nothing, a wire bent into a square, and three fenced sides against a wall, before a redo of the area-for-perimeter slip.
Quick answer 10 questions, about 20 minutes. Items 01 to 03 are a rectangle, a square and a unit conversion; items 04 to 06 are a larger rectangle, a side found from a perimeter and a width found from a perimeter; items 07 to 09 are a shape with a corner removed, wire bent into a square and three fenced sides; item 10 redoes the area and perimeter mix-up.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 questions |
| Suggested time | 20 minutes |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: Primary 3 Maths: Perimeter and Length — Tutor Lesson Plan |
| Level | Primary 3 |
02 Questions (10 items)
- FoundationA rectangle is 8 cm long and 5 cm wide. What is its perimeter?
- FoundationA square has sides of 6 cm. What is its perimeter?
- FoundationConvert: (a) 3 m 20 cm into cm; (b) 450 cm into m and cm.
- IntermediateA rectangle is 12 cm by 7 cm. What is its perimeter?
- IntermediateA square has a perimeter of 32 cm. How long is each side?
- IntermediateA rectangle has a perimeter of 30 cm and a length of 9 cm. What is its width?
- ChallengeA 12 cm by 7 cm rectangle loses a 5 cm by 3 cm corner. The six outer segments of what is left, in order, are 12, 4, 5, 3, 7 and 7 cm. What is the perimeter, and how does it compare?
- ChallengeA 36 cm length of wire is bent into a square. How long is each side?
- ChallengeA garden is 6 m by 4 m and sits against a wall, so only three sides are fenced. How much fencing is needed?
- Error redoFor a 9 cm by 4 cm rectangle a student answers a perimeter of 36 cm. What went wrong, and what is the right answer?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 26 cm | (8 + 5) × 2 = 26: the four sides become two lots of length plus width, which is quicker than adding each side. |
| 2 | 24 cm | A square has four equal sides, so side × 4 gives 6 × 4 = 24; multiplying by 2 would count only two sides. |
| 3 | (a) 320 cm; (b) 4 m 50 cm | 1 m = 100 cm, so 3 m is 300 cm and 20 cm more makes 320 cm; the other way, 450 cm less 400 cm leaves 50 cm. |
| 4 | 38 cm | (12 + 7) = 19 and 19 × 2 = 38; one length-plus-width first, then double it, is the shortest route. |
| 5 | 8 cm | Working backwards means dividing: 32 ÷ 4 = 8, and 8 × 4 = 32 checks it. |
| 6 | 6 cm | 30 ÷ 2 = 15 is one length plus one width, and 15 − 9 = 6; 2 × (9 + 6) = 30 checks it. |
| 7 | 38 cm, the same as before | 12 + 4 + 5 + 3 + 7 + 7 = 38, the same as (12 + 7) × 2: cutting a corner only moves two outer edges to a new position, so the total boundary stays the same. |
| 8 | 9 cm | The wire is the perimeter: 36 ÷ 4 = 9. Bent into a rectangle instead, the perimeter would still be 36 cm. |
| 9 | 14 m | The wall side needs no fence: 6 + 4 + 4 = 14. Fencing all four sides would be (6 + 4) × 2 = 20 m, one length too many. |
| 10 | 36 is the area (9 × 4); the perimeter is 26 cm | Perimeter is the walk around: (9 + 4) × 2 = 26 cm, measured in cm. The 36 cm² figure is the area filling the inside. |
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.
