NCERT Revision Notes for Class 1 Maths Chapter 9: Utsav – Free PDF Download

Chapter 9 of Class 1 Joyful Mathematics, Utsav, uses the festive theme of celebrations and decorations to teach children about shapes and patterns — recognising basic 2D shapes, spotting shapes in decorations, and continuing simple repeating patterns.

Key Concepts

Basic 2D shapes: circle, square, triangle, and rectangle — flat shapes that children learn to recognise and name.

Shapes in surroundings: spotting these basic shapes in everyday festive items, like round diyas, square rangoli tiles, or triangular flags.

Repeating patterns: a sequence where a group of shapes, colours, or objects repeats in the same order again and again, such as circle, triangle, circle, triangle.

Growing patterns: a simpler introduction to patterns that increase in a predictable way, such as 1 flag, 2 flags, 3 flags in a row.

Sorting shapes: grouping objects together based on their shape, such as putting all round decorations in one pile and all square ones in another.

Worked Examples

Example 1

Look at a string of festival flags: triangle, square, triangle, square. What shape comes next? A triangle, because the pattern repeats triangle-square in that order.

Example 2

A rangoli design uses circles and triangles in the pattern: circle, circle, triangle, circle, circle, triangle. What repeats in this pattern? A group of two circles followed by one triangle repeats throughout the design.

Example 3

Sort these festival items by shape: a round diya, a square gift box, a round coin, a triangular flag. Round: diya, coin. Square: gift box. Triangular: flag.

Quick Recap

• Circles, squares, triangles, and rectangles are the basic 2D shapes learned in this chapter.
• Shapes can be spotted all around us, especially in festival decorations.
• A repeating pattern follows the same group of shapes, colours, or objects again and again.
• Sorting objects by shape helps organise and compare them.
• Predicting what comes next in a pattern is an important early maths reasoning skill.

Common Mistakes to Avoid

• Confusing a square with a rectangle, since both have four straight sides and four corners.
• Breaking a pattern by guessing randomly instead of looking carefully at what repeats.
• Sorting an object into the wrong shape group because of its colour or size rather than its actual shape.
• Missing the repeating unit in a longer pattern and predicting the wrong next shape.
• Assuming all round objects are the same shape as a circle, when some, like an oval, are only similar but not identical.

Home Practice Tips

• Look at festival decorations, rangoli, or greeting cards at home and identify the shapes used.
• Create a simple repeating pattern using buttons, beads, or coloured paper cut-outs.
• Ask the child to continue a pattern you start, such as red, blue, red, blue.
• Sort household items, like utensils or toys, by their shape.
• Draw a row of shapes with one missing and ask the child to fill in what comes next.

Frequently Asked Questions

Q1. Why does this chapter use the theme of Utsav (festival)?
Festivals are full of colourful decorations, rangoli patterns, and shaped objects, making them a natural and engaging way to teach shapes and patterns to young children.

Q2. What is the difference between a square and a rectangle?
A square has four equal sides, while a rectangle has two pairs of equal sides that are not all the same length; both have four straight sides and four right-angle corners.

Q3. How can I help my child spot patterns more easily?
Start with simple two-item patterns, like red-blue-red-blue, and ask the child to say what comes next before moving on to slightly longer patterns.

Q4. Why is sorting by shape an important skill?
Sorting helps children organise information logically and notice similarities and differences between objects, which is a key early reasoning skill.

Q5. How does this chapter connect to later geometry topics?
Recognising and naming basic shapes here builds the foundation for learning about the properties of shapes, symmetry, and more complex geometry in later classes.

Full walkthrough: Chapter 9 Solutions · Extra Questions.

Written by Satish

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