Primary 4 Mathematics · Chapter 12 · Answers and explanations

Lesson 12.1: Recall: Area and Perimeter (answers)

Section A · Multiple choice 4 marks

1. Each square is 1 cm by 1 cm. What is the area of the shaded figure?1 mark

(A) 10 cm²(B) 12 cm²(C) 5 cm²(D) 6 cm²

Answer: (C) 5 cm²Count the shaded squares: 5 squares, so the area is 5 cm².

2. Each square is 1 cm by 1 cm. What is the perimeter of the shaded figure?1 mark

(A) 5 cm(B) 10 cm(C) 14 cm(D) 12 cm

Answer: (D) 12 cmThe figure fits inside a 3 cm by 3 cm square, so its perimeter is 3 + 3 + 3 + 3 = 12 cm.

3. A rectangle is 12 cm long and 5 cm wide. What is its area?1 mark

(A) 60 cm²(B) 34 cm²(C) 17 cm²(D) 600 cm²

Answer: (A) 60 cm²Area = length × breadth = 12 × 5 = 60 cm².

4. What is the perimeter of a square with sides of 7 m?1 mark

(A) 49 m(B) 28 m(C) 14 m(D) 21 m

Answer: (B) 28 mPerimeter = 4 × side = 4 × 7 = 28 m.

5. What is the area of a rectangle 9 cm by 6 cm?1 mark

Answer: 54 cm²9 × 6 = 54 cm².

6. What is the perimeter of a rectangle 9 cm by 6 cm?1 mark

Answer: 30 cm9 + 6 + 9 + 6 = 30 cm.

7. What is the area of a square with sides of 8 m?1 mark

Answer: 64 m²8 × 8 = 64 m².

8. What is the perimeter of a rectangle 15 m long and 4 m wide?1 mark

Answer: 38 m15 + 4 + 15 + 4 = 38 m.

9. Each square is 1 cm by 1 cm. What is the area of the shaded figure?1 mark

Answer: 6 cm²Count the shaded squares: 6 squares, so the area is 6 cm².

10. A rectangular field is 25 m long and 12 m wide. Find its area and its perimeter.2 marks

Answer: Area 300 m²; perimeter 74 mArea: 25 × 12 = 300 m². Perimeter: 25 + 12 + 25 + 12 = 74 m.

11. Sam walks once round a square park with sides of 35 m. How far does he walk?2 marks

Answer: 140 m4 × 35 = 140. He walks 140 m.

12. A rectangle has an area of 48 cm². Its length is 8 cm. What is its perimeter?2 marks

Answer: 28 cmBreadth = 48 ÷ 8 = 6 cm. Perimeter = 8 + 6 + 8 + 6 = 28 cm.

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