Primary 4 Mathematics · Chapter 13 · Answers and explanations
Lesson 13.5: Identifying Nets (answers)
Section A · Multiple choice 4 marks
1. Which plan is a net of a cube?1 mark
(A) Net A(B) Net B(C) Net C(D) None of them
Answer: (B) Net BNet B has the right pattern. A is a block and C is a row of 5 squares.
2. Which plan is a net of a prism?1 mark
(A) Net A(B) Net B(C) Net C(D) None of them
Answer: (A) Net ANet A has 3 rectangles and 2 triangles: a triangular prism.
3. Which plan is a net of a pyramid?1 mark
(A) Net A(B) Net B(C) Net C(D) None of them
Answer: (C) Net CNet C has a square and 4 triangles that meet at the top.
4. Two plans are nets of a cube. Which one is NOT?1 mark
(A) Net A(B) Net B(C) Net C(D) None of them
Answer: (B) Net BNet B has two squares on the same side of a row of 4. Two faces overlap.
Section B · Write your answer 11 marks
5. How many squares are there in a net of a cube?1 mark
Answer: 6A cube has 6 faces.
6. This net is made of 6 rectangles. What solid does it make?1 mark
Answer: cuboid6 rectangles fold into a cuboid.
7. This net has 3 rectangles and 2 triangles. What solid does it make?1 mark
Answer: triangular prism3 rectangles and 2 triangles fold into a triangular prism.
8. This net has 1 square and 4 triangles. What solid does it make?1 mark
Answer: square pyramidThe triangles meet at a vertex above the square.
9. A net is made of 4 triangles of the same size. What solid does it make?1 mark
Answer: triangular pyramidA triangular pyramid has 4 triangular faces.
10. Is this plan a net of a cube? Write yes or no and give a reason.2 marks
Answer: No; the row of 5 squares overlaps when foldedFive squares in a row cannot fold without the ends overlapping.
11. How many rectangles and how many triangles are in the net of a triangular prism?2 marks
Answer: 3 rectangles and 2 trianglesCount the faces of a triangular prism: 3 rectangles and 2 triangles.
12. Is this plan a net of a cube? Write yes or no and give a reason.2 marks
Answer: Yes; the squares do not overlap when foldedThe staircase pattern folds into a cube.
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