NCERT Solutions for Class 3 Maths Chapter 02 Toy Joy

Chapter 2: Toy Joy

Question. Use old boxes (cubes and cuboids) and bottles (cylinders) to do craft work. Draw faces on them. What did you draw on their faces?
Answer: We can draw happy, cartoon faces with big shiny eyes, cute button noses, smiling mouths, and funny expressions on the boxes and bottles.
In simple words: We can decorate our recycled toy boxes by painting funny eyes and happy smiles on them.

Exam Tip: Use simple, bright markers or colored paper to make the cartoon features stand out clearly on your toy crafts.

Question. Jaya is building a rocket with her shapes. What shapes has she used? How many of each?
Answer: Here is the count of the shapes Jaya used to build her toy rocket:
* Cube: 2
* Cuboid: 4
* Cone: 1
* Cylinder: 1
In simple words: Jaya built her rocket using two cubes, four cuboids, one pointed cone, and one round cylinder.

Exam Tip: Look closely at the picture and count the shapes from top to bottom to make sure you do not miss any parts.

Question. What shape is between the red cuboid and yellow cuboid? What shape is on the top of the orange cylinder? What shape is under the pink cone?
Answer: Based on the blocks in the picture:
* The shape between the red cuboid and yellow cuboid is a Cylinder.
* The shape on top of the orange cylinder is a Cube.
* The shape under the pink cone is a Cube.
In simple words: A cylinder is placed between the red and yellow blocks, while a cube is sitting on the orange can and under the pink cone.

Exam Tip: Read the color names carefully to identify the correct position of each block in the stack.

Question. Devika went to a shop and bought a toy engine. Here is Devika's toy engine. It has many parts. Count and fill.
Answer: Here is the count of the shapes on Devika's toy engine:
* 1 red cylinder
* 2 yellow cones
* 1 grey cuboid
* 1 blue cube
In simple words: The toy engine is made from one red cylinder, two yellow cones, one grey cuboid, and one blue cube.

Exam Tip: Double check your count by pointing at each part of the toy engine with a pencil so you do not repeat any numbers.

Question. Here are some more toys from the toy shop. They are made up of different shapes. What shapes are used in these toys?
Answer: These toys are made of simple 3D shapes:
* Toy Dog: Made of a Cone (for the head) and a Cylinder (for the body).
* Ball and Bat: Made of a Sphere (for the ball) and a Cylinder (for the handle/bat).
* Toy Cat: Made of Cones (for the ears), a Sphere (for the head), and a Cylinder (for the body).
* Stacked Blocks: Made of Cuboids and Cubes.
In simple words: The toys are made of cones, cylinders, spheres, cubes, and cuboids. For example, the toy ball is a sphere.

Exam Tip: Practice identifying 3D shapes on common toys, like calling a round marble a "sphere" instead of a flat "circle."

Question 1. Can you find these shapes in the classroom? Fill in the table with their names.
• Name the shape that you find the most. ________
• Name the shape that you find the least. ________
• Name the objects that are made up of more than one shape. ________
Answer: Here is the completed table showing classroom objects grouped by their shapes:

* a. Shape found the most: Cuboid (such as books, boxes, and desks).
* b. Shape found the least: Cone (only a few items like birthday caps are cones).
* c. Object made of more than one shape: Eraser (it can have a cuboid body with slanted ends) or a sharpener.
In simple words: Cuboids are very easy to find in a classroom, but cones are the hardest to find.

Exam Tip: Look around your classroom and think of standard items like books (cuboids) and chalks (cylinders) to easily fill out your list.

Question 2. Look at these shapes and answer the following questions.
• Circle the cubes.
• Put a tick (✓) against the shapes that are cones.
• Put a cross (✗) against the shapes that are cylinders.
• Put a box [ ] around the cuboids.
Answer: This is a shape sorting activity:
* We draw a circle around all the Cubes (like dice).
* We put a checkmark (✓) on all the Cones (like party hats).
* We put an 'X' (✗) on all the Cylinders (like water bottles).
* We draw a box around all the Cuboids (like books).
In simple words: This exercise helps us identify and group cubes, cones, cylinders, and cuboids from a mixed pile.

Exam Tip: Be careful not to confuse a squashed cylinder with a flat circle, and look at the curved faces to spot the difference.

Question 3. Name the shapes
• with no edges. ________
• with only flat faces. ________
• with only curved faces. ________
• with both straight and curved edges. ________
• with both flat and curved faces. ________
Answer: Based on the properties of 3D shapes:
* with no edges: Sphere
* with only flat faces: Cube, Cuboid
* with only curved faces: Sphere
* with both straight and curved edges: Cone
* with both flat and curved faces: Cylinder
In simple words: Spheres have no edges or corners, cubes and cuboids have only flat sides, and cylinders have both flat and curved parts.

Exam Tip: Remember that a sphere has a single continuous curved surface, so it does not have any edges or vertices.

Question 4. Which shapes can you build?
Answer: We can build 3D skeletons of shapes using small balls of wet clay for the corners (vertices) and dry matchsticks for the straight sides (edges). We can easily build a cube, a pyramid, and a prism this way.
In simple words: We can make skeleton models of cubes and pyramids using matchsticks and clay balls.

Exam Tip: In these models, clay balls act as the "corners" (vertices) and matchsticks act as the "edges."

Question 5. Try to make these shapes using cubes.
Answer: This is a building block activity. We can stack toy building blocks (cubes) together to recreate the T-shapes and cross patterns shown in the book.
In simple words: We can build different shapes by stacking flat rows and tall columns of plastic toy blocks together.

Exam Tip: Count the number of blocks used in each row and column first before you start building your shape.

Question. Let us Play. There is a game along the border of this page. Roll the die and move the counter to the next picture associated with the number on the die (if possible without crossing the "Finish" square) and play the game with your friends. The one who reaches the finish mark first wins the game.
Answer: This is an exciting board game to play with friends! We roll a die, count the dots, and move our game tokens to the nearest matching shape (cube, cone, sphere, cylinder, or cuboid) printed on the board track. The first player to land exactly on the 'Finish' box wins the game.
In simple words: Roll the die and move your token to the next matching shape on the board. The first player to reach the finish wins!

Exam Tip: Practice identifying the shape on each square quickly so you can make your moves without any help.

Question 6. In what ways are these shapes the same? In what ways are they different?
Answer:
* How they are the same:
* They are all solid, 3D shapes that you can hold in your hand.
* They all take up space and have surfaces.
* How they are different:
* Cylinder: Looks like a tin can. It has two flat circle faces and one curved side.
* Cube: Looks like a dice block. It has six flat, equal square faces.
* Cone: Looks like a pointed party hat. It has one flat circle base and a sharp tip.
* Rectangular Prism (Cuboid): Looks like a brick. It has six flat rectangular faces.
* Sphere: Looks like a round ball. It has no flat sides and no corners at all.
In simple words: They are all 3D shapes, but they have different faces. A cube is made of flat squares, while a sphere is completely round.

Exam Tip: Use terms like "curved face" and "flat face" to clearly explain why a sphere is different from a cube.

Question 7. Look at a die. The faces have 1 to 6 dots. What number is on:
• the face opposite number 1? ________
• the face opposite number 2? ________
• the face opposite number 3? ________
• What pattern do you notice?
Answer: Based on how a playing die is made:
* The face opposite number 1 is 6.
* The face opposite number 2 is 5.
* The face opposite number 3 is 4.
* The pattern we notice: When we add the numbers on opposite sides of a playing die, the total is always exactly 7 (for example, 1 + 6 = 7, 2 + 5 = 7, and 3 + 4 = 7).
In simple words: The numbers on opposite sides of a die always add up to seven. For example, 1 is opposite 6, and 2 is opposite 5.

Exam Tip: Remember this simple math rule: the sum of opposite faces on a standard die is always 7.

Question 8. In what order is this model built?
Answer: To build this block model, we follow these steps:
1. Bottom Base: Lay down the flat rectangular wooden blocks on the floor to make the bottom foundation.
2. Pillars: Place four yellow cylinders standing up at each of the four corners of the base.
3. Top Roof: Balance a second yellow rectangular board flat on top of the four pillars.
4. Spikes: Place a small blue cone on each of the four corners of the top roof.
5. Under Blocks: Slide the small pink cubes underneath the bottom base.
In simple words: Lay the flat base first, put the cylinder pillars on the corners, place the top board, add cones on top, and slide pink cubes underneath.

Exam Tip: Break down construction models into layers (Base, Pillars, Roof, and Details) to describe them logically.

Question 9. In how many different ways can you join 3 cubes? Try and see.
Answer: We can join three cubes together in two different shapes:
1. A straight tower made of three cubes stacked vertically.
2. An L-shape made by placing two cubes next to each other and one on top.
In simple words: We can join three blocks in a straight line or make an L-shape with them.

Exam Tip: Draw both the straight vertical stack and the angled L-shape to show your answers clearly.

Question 10. Name the shapes used in these models. Describe how the shapes are arranged to make them.
Answer: These models are made using simple rectangular blocks:
* Model (a): Built using three rectangular blocks. We place two green blocks flat, and sandwich a red block horizontally between them in the middle.
* Model (b): Built using four blocks. We stand two orange blocks up like pillars. We lay a red block flat in the middle, and top it all off with a green block laid flat across the top.
* Model (c): Built using five blocks. We stack three orange blocks vertically like a tall tower. We place a red block flat on top, and top it with a green block laid horizontally.
* Model (d): Built with four blocks. We lay two green blocks horizontally at the bottom and top. We place an orange block horizontally in the center, and stand a red block on the side to connect them.
In simple words: These structures are built by stacking colored bricks flat or standing them up like pillars to make columns and bridges.

Exam Tip: Describe each model step-by-step, starting from the bottom layer and moving to the top layer.

Question 11. Use six dice [dice icon] to make the following shapes: (a) A Cuboid (b) A tower (c) Any other shape of your choice
Answer: We can arrange six toy dice in these fun ways:
* For (a) - A Cuboid: Place three dice in a row, and stack another three dice directly on top to make a wide rectangular box.
* For (b) - A Tower: Stack all six dice straight up, one on top of the other, to build a tall column.
* For (c) - My Custom Shape: Arrange the six dice like steps or stairs, or build a cute L-shape.
In simple words: We can use six dice to make a wide flat box (cuboid), a tall straight tower, or a stepped stair-shape.

Exam Tip: Practice stacking your dice gently so the tall tower does not fall down during your math activity.