Toy Joy
Class 3 · Mathematics
5 ideas in Class 3 Mathematics, explained in plain words, with games and quizzes to practise.
Recognising 3D Shapes
Part of: 3D Shapes in Our World
Three-dimensional shapes are objects you can hold and turn in your hands. They are not flat like a paper circle. A cube is like a box with equal sides (like a dice). A cuboid looks like a shoe box—longer or wider than it is tall. A cylinder is like a tin of biscuits, round and straight. A cone is like an ice cream cone—pointy at one end. A sphere is a ball—round like an orange.
Why it matters. Understanding 3D shapes helps your child see the world around them. Toys, buildings, food, and furniture are all made of these shapes. When you understand shapes, you can describe what you see and build things yourself.
Try it in two minutes
- Gather five objects: a dice, a shoe box, a tin or bottle, a cone-shaped paper cup, and a ball. Place them on a table.
- Point to each object and ask: 'Can you roll this? Can you stack this? Which edges are pointy?' Let your child touch and turn each shape.
- Now hide the objects one at a time. Say the shape name (cube, cuboid, etc.) and ask your child to find the matching object in the room.
Try at home. Challenge your child to find these five shapes in your home—in the kitchen, bedroom, and bathroom. Make a list together.
Faces, Edges, and Corners of Shapes
Part of: Properties of 3D Shapes
Every 3D shape has parts: faces are the flat or curved surfaces, edges are the lines where two faces meet, and corners are the pointy places where edges come together. A cube has 6 square faces, 12 edges, and 8 corners. A cuboid is similar but the faces may not all be square. A cylinder has 2 flat circular faces, 0 sharp corners, and 2 edges where the flat and curved parts meet. A cone has 1 flat face and 1 pointy corner. A sphere has no flat faces, edges, or corners—it is all curved.
Why it matters. Understanding these properties helps you recognize shapes from any angle. When you describe an object, you can say what kinds of faces, edges, and corners it has. This skill helps in building, design, and understanding how things fit together.
Try it in two minutes
- Take a box (cuboid) and a dice (cube). Ask: 'How many flat sides do you see? Can you find a sharp corner? Touch the edges—where two flat parts meet.'
- Hold a bottle (cylinder) and ask: 'Is the top flat? Is the bottom flat? Can you see any sharp corners? Follow your finger around the edge where the flat top meets the curve.'
- Show a cone (like a party hat) and ask: 'Is there a pointy part? Is the bottom flat? How many flat faces do you count?'
Try at home. Give your child 3D shapes (blocks or real objects) and ask them to count the faces, edges, and corners. Keep a chart: Cube (6 faces, 12 edges, 8 corners), Cuboid (6 faces, 12 edges, 8 corners), Cylinder (2 faces, 0 corners, 2 edges).
Combining Shapes to Make New Objects
Part of: Building with Shapes
You can combine different 3D shapes to make new things. A rocket can be made with a cylinder for the body and a cone for the pointed top. A toy train might have cuboid blocks for the cars and cylinders for wheels. When you stack and arrange shapes, you create structures. By understanding how shapes fit together, you can build anything from simple stacks to complex designs.
Why it matters. Building with shapes develops spatial thinking—the ability to imagine objects in space and understand how they fit together. This skill helps with architecture, design, engineering, and even understanding how furniture fits in a room. It also teaches your child to think creatively and solve problems.
Try it in two minutes
- Gather toy blocks or similar objects: cubes, cuboids, cones, cylinders, and spheres.
- Show your child how to stack a cylinder, then add a cone on top to make a rocket or tower.
- Ask: 'What happens if you add a cuboid? Can you balance a sphere on top? Which shapes are easiest to stack and why?'
Try at home. Challenge your child to build a house using different shapes. Which shapes work best for walls? Which for the roof? Can they build a tower that doesn't fall over?
Sorting Shapes by Properties
Part of: Classifying and Comparing Shapes
You can sort shapes into groups based on their features. For example, shapes with only flat faces (cube, cuboid), shapes with curved surfaces (cylinder, cone, sphere), shapes with corners (cube, cuboid, cone), and shapes with no corners (cylinder, sphere). By thinking about these properties, you understand the differences and similarities between shapes.
Why it matters. Sorting helps your child think logically and notice patterns. When you group shapes by properties, you see how they are the same and different. This develops reasoning skills used in maths, science, and problem-solving.
Try it in two minutes
- Place five 3D shapes on a table: cube, cuboid, cylinder, cone, sphere.
- Ask your child to point to all shapes with no corners. (Cylinder and sphere.) Ask: 'Which one can roll? Which one has flat parts?'
- Now ask: 'Which shapes have pointy corners?' (Cube, cuboid, cone.) 'Which ones have all flat faces?' (Cube and cuboid.)
Try at home. Sort toys or objects around your home. Make groups: shapes that roll vs. shapes that do not roll, shapes with flat tops vs. shapes with round tops, shapes with no corners vs. shapes with corners.
Opposite Faces and Die Patterns
Part of: Understanding Opposite Faces
On a die (a cube), there are six faces with dots from 1 to 6. The opposite faces follow a pattern: 1 is opposite 6 (add to 7), 2 is opposite 5 (add to 7), and 3 is opposite 4 (add to 7). Every pair of opposite faces adds up to 7. This pattern is true for all standard dice. In a cube or cuboid, opposite faces are the ones you cannot see at the same time—if you look at the front and the back, they are opposite faces.
Why it matters. Understanding opposite faces helps you visualize shapes from different angles. If you know what one face looks like, you can figure out what the opposite face must look like. This skill is useful for board games, visualizing 3D objects, and spatial reasoning.
Try it in two minutes
- Get a die or a cube with numbers/colors on each face. Ask your child: 'Which number is opposite the 1? Try turning the die to check.'
- Help them discover the pattern: '1 and 6 are opposite. 2 and 5 are opposite. 3 and 4 are opposite. What do you notice? (They add to 7.)'
- Ask: 'If I show you a 5, what number must be on the opposite side?' (2, because 5 + 2 = 7.)
Try at home. Make a cube from paper or clay and put numbers on the six faces. Follow the die pattern (opposite faces add to 7). Test by rolling it and checking the pattern.
What your child will practise
- Combining Shapes to Make New Objects: Jungle Quick Fire (Quick Fire)
- Faces, Edges, and Corners of Shapes: Candy Puzzle (Clue Puzzle)
- Opposite Faces and Die Patterns: Desert Puzzle (Clue Puzzle)
- Recognising 3D Shapes: Toy Shop Quest (Collect the Answer)
- Sorting Shapes by Properties: Ocean Quest (Flip and Match)
- Quiz: Combining Shapes to Make New Objects (8 questions)
- Quiz: Faces, Edges, and Corners of Shapes (8 questions)
- Quiz: Opposite Faces and Die Patterns (8 questions)
- Quiz: Recognising 3D Shapes (8 questions)