Primary 4 Mathematics · Chapter 13 · Answers and explanations
Lesson 13.1: Recall: Naming Solids (answers)
Section A · Multiple choice 4 marks
1. What is this solid?1 mark
(A) cylinder(B) pyramid(C) cone(D) sphere
Answer: (C) coneIt has a round flat base and comes to a point: a cone.
2. A tin of beans is shaped like which solid?1 mark
(A) cone(B) cuboid(C) sphere(D) cylinder
Answer: (D) cylinderIt has 2 flat circles and 1 curved face: a cylinder.
3. A football is shaped like which solid?1 mark
(A) sphere(B) cone(C) cylinder(D) cube
Answer: (A) sphereA ball is round all over and has no flat face: a sphere.
4. A dice has 6 faces. All are squares of the same size. What solid is it?1 mark
(A) cuboid(B) cube(C) cone(D) cylinder
Answer: (B) cubeAll the faces are equal squares: a cube.
Section B · Write your answer 11 marks
5. Name this solid.1 mark
Answer: cuboidIt has 6 rectangular faces: a cuboid.
6. How many flat faces does a cylinder have?1 mark
Answer: 2The top and the bottom are flat circles. The side is curved.
7. Name two solids that have a curved face.1 mark
Answer: Any two of: cone, cylinder, sphereA cone, a cylinder and a sphere all have a curved face.
8. How many flat faces does a cone have?1 mark
Answer: 1Only the round base is flat.
9. Which solid has no flat face?1 mark
Answer: sphereA sphere is round all over.
10. Name the solid that looks like (a) a ball (b) a tissue box.2 marks
Answer: (a) sphere (b) cuboidA ball is a sphere. A tissue box has 6 rectangular faces, so it is a cuboid.
11. How many flat faces does a cube have? What shape are they?2 marks
Answer: 6 faces; squaresA cube has 6 flat faces. Each face is a square.
12. Name the solid with 1 flat face and 1 curved face. Then name the solid with 2 flat faces and 1 curved face.2 marks
Answer: cone; cylinder1 flat and 1 curved face: cone. 2 flat and 1 curved face: cylinder.
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