Primary 4 Mathematics · Chapter 13 · Answers and explanations

Lesson 13.4: Drawing on Isometric Grids (answers)

Section A · Multiple choice 4 marks

1. How many units high is this cuboid?1 mark

(A) 3 units(B) 2 units(C) 1 unit(D) 4 units

Answer: (B) 2 unitsCount up a vertical edge: 2 units.

2. How many units long is each side of the base of this pyramid?1 mark

(A) 2 units(B) 4 units(C) 3 units(D) 5 units

Answer: (C) 3 unitsCount along the square base: 3 units.

3. Each edge of this cube is how many units long?1 mark

(A) 2 units(B) 4 units(C) 6 units(D) 3 units

Answer: (D) 3 unitsCount along one edge: 3 units.

4. Which drawing shows a cube?1 mark

(A) Drawing A(B) Drawing B(C) Drawing C(D) None of them

Answer: (B) Drawing BAll the edges of Drawing B are the same length.

5. How many units high is this cuboid?1 mark

Answer: 4 unitsCount up a vertical edge: 4 units.

6. How many units long is each edge of this cube?1 mark

Answer: 2 unitsCount along an edge: 2 units.

7. How many units high is this prism?1 mark

Answer: 2 unitsCount up a vertical edge: 2 units.

8. On an isometric grid we draw only the parts of the solid that we can ___.1 mark

Answer: seeWe draw only the parts that can be seen.

9. How many units long is each side of the base of this pyramid?1 mark

Answer: 3 unitsCount along the square base: 3 units.

10. (a) How many units high is this cuboid? (b) How many units long is its longest base edge?2 marks

Answer: (a) 3 units (b) 4 unitsCount up a vertical edge: 3. Count along the longest edge of the base: 4.

11. A cuboid is 5 units high. A cube with edges of 2 units is placed on top of it. How many units high are they together?2 marks

Answer: 7 units5 + 2 = 7 units.

12. Two cuboids are stacked. One is 3 units high and the other is 2 units high. How many units high is the stack?2 marks

Answer: 5 units3 + 2 = 5 units.

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