Class 4 Computational Thinking & AI
Official CBSE Student Handbook curriculum with 280 interactive practice questions (20 questions per chapter), parity error-detecting grids, hardware sorting networks, 3D voxel nets, and step-by-step logic solutions.
Shapes Around Us
Shapes Around Us covers 3D voxel arithmetic, cube net invariants, planar cut angle logic, and spatial vertex color constraints.
Practice Questions (20)
Click an option to test your solutionBricks are stacked in a pattern: Row 1 has 1 brick, Row 2 has 3, Row 3 has 5. How many bricks are in Row 7?
Hint: Look at the pattern: 1, 3, 5, 7... Each row adds 2 more bricks. The nth row has (2n-1) bricks.
A wall is built with 8 bricks per row. If the wall has 12 rows, how many bricks are needed in total?
Hint: Multiply bricks per row by number of rows.
Blocks are arranged: 1 red, 2 blue, 1 red, 2 blue... Which colour is the 11th block?
Hint: Find the cycle length (3: R, B, B). Divide 11 by 3 and use the remainder to find the position.
A building has 5 floors. Each floor has 4 flats. Each flat has 3 rooms. How many rooms are in the building?
Hint: Multiply floors x flats per floor x rooms per flat.
A staircase adds one step each time it rises. Steps: 1, 3, 6, 10, 15... What is the next number?
Hint: Look at the differences between consecutive terms: 2, 3, 4, 5... The next difference is 6.
A cube is made of smaller unit cubes. The cube is 3 units on each side. How many unit cubes make it?
Hint: Multiply length x width x height: 3 x 3 x 3 = 27.
Bricks are placed in an L-shape: 5 bricks horizontal, then 3 bricks go up (sharing the corner). How many bricks total?
Hint: Add both lengths, then subtract the shared corner brick counted twice.
A pattern of squares: 1 square needs 4 sticks. 2 squares in a row need 7 sticks. 3 squares need 10. How many sticks for 6 squares?
Hint: Notice each new square adds only 3 sticks (it shares one side). Formula: 3n + 1.
A rectangular room is 6 m long and 4 m wide. How many square tiles of side 1 m are needed to cover the floor?
Hint: Multiply length by width to get the number of 1x1 tiles.
Bricks weigh 2 kg each. A wall uses 150 bricks. What is the total weight of bricks?
Hint: Multiply the number of bricks by the weight per brick.
How many vertices (corners) does a square pyramid have?
Hint: 4 on the bottom square + 1 on the top point = 5 vertices.
What is the total number of edges on a triangular prism?
Hint: 3 + 3 + 3 = 9 edges.
Which polygon has 7 sides?
Hint: 'Hepta' means 7.
How many diagonals can be drawn inside a regular pentagon?
Hint: A pentagon has 5 diagonals forming a star inside.
If you unfold a cone along its slant height, what 2D shape is the lateral surface?
Hint: Unrolling a cone gives a fan-shaped circular sector.
How many lines of symmetry does a regular octagon have?
Hint: A regular octagon has 8 equal sides and 8 lines of symmetry.
What is the angle sum of all interior angles of a quadrilateral?
Hint: Two triangles make 180° + 180° = 360°.
Which of the following 3D solids has NO flat faces?
Hint: A ball is completely curved with no flat surfaces.
How many unit cubes are in a solid 4×4×4 cube?
Hint: 4³ = 64.
How many right angles are formed when two perpendicular lines intersect?
Hint: A cross (+) creates 4 right angles.
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