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Primary 3 Maths: Perimeter and Length — Practice Paper 2 (10 Questions)
Primary 3 Maths: Perimeter and Length — Practice Paper 2 (10 Questions)
Paper 2 uses larger numbers and adds two new shapes of question: a triangle walked round, and two squares joined so that the perimeter shrinks. The second half works backwards from a fixed length of string, and the last item redoes the square multiplied by two.
Quick answer 10 questions, about 20 minutes. Items 01 to 03 cover a rectangle, a square and metres to centimetres; items 04 to 06 cover a larger rectangle, a side from a perimeter and a length from a perimeter; items 07 to 09 cover a triangle, two joined squares and string bent into a rectangle; item 10 redoes the square multiplied by two.
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 9 cm long and 6 cm wide. What is its perimeter?
- FoundationA square has sides of 15 cm. What is its perimeter?
- FoundationConvert: (a) 2 m 45 cm into cm; (b) 380 cm into m and cm.
- IntermediateA rectangle is 25 cm by 14 cm. What is its perimeter?
- IntermediateA square has a perimeter of 44 cm. How long is each side?
- IntermediateA rectangle has a perimeter of 50 cm and a width of 8 cm. What is its length?
- ChallengeA triangle has sides of 7 cm, 9 cm and 12 cm. What is its perimeter?
- ChallengeTwo squares of side 8 cm are joined side by side into a rectangle. What is the perimeter of the rectangle, and how does it compare with the total perimeter of the two squares?
- ChallengeA 60 cm string is used to make a rectangle 18 cm long. What is its width?
- Error redoFor a square of side 9 cm a student answers a perimeter of 18 cm. What went wrong, and what is the right answer?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 30 cm | (9 + 6) × 2 = 30, and 9 + 6 + 9 + 6 = 30 checks it: adding the four sides gives the same total. |
| 2 | 60 cm | A square has four equal sides, so 15 × 4 = 60 cm: one side walked once, four sides walked four times. |
| 3 | (a) 245 cm; (b) 3 m 80 cm | 1 m = 100 cm, so 2 m is 200 cm and 45 cm more makes 245 cm. In 380 cm there are three lots of 100 cm and 80 cm left over. |
| 4 | 78 cm | 25 + 14 = 39 and 39 × 2 = 78. Add one length and one width first, then double, which is faster than adding four numbers. |
| 5 | 11 cm | Work backwards with division: 44 ÷ 4 = 11 cm, and 11 × 4 = 44 brings the four sides back to the given perimeter. |
| 6 | 17 cm | 50 ÷ 2 = 25 is one length plus one width, then 25 − 8 = 17, and 2 × (17 + 8) = 50 checks it. |
| 7 | 28 cm | A triangle is still one lap: 7 + 9 + 12 = 28 cm. No two sides are equal here, so each side is added once. |
| 8 | 48 cm, which is 16 cm less than the 64 cm total of the two squares | The rectangle is 16 cm by 8 cm, so (16 + 8) × 2 = 48 cm. The 8 cm edge where the squares meet is no longer on the outside, so two 8 cm edges drop out of the count. |
| 9 | 12 cm | The string is the perimeter: 60 ÷ 2 = 30 is one length plus one width, 30 − 18 = 12, and 2 × (18 + 12) = 60 checks it. |
| 10 | Only two sides were counted; the perimeter is 36 cm | 18 is 9 × 2, which counts two sides. A square has four sides, so 9 × 4 = 36 cm. |
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.
