Mathematics Class 1 - Number Sense Notes

Number Sense

Welcome to the chapter on Number Sense for Class 1. In this chapter, you will learn about numbers, how to count, compare, and order them, and how to use numbers in daily life. By the end of this chapter, you will be able to recognize numbers, count objects, and understand the value of numbers.

Introduction

Numbers help us count things, tell how many objects there are, and compare groups. We use numbers every day when we count toys, books, or even steps!

Key Concepts

• Numbers: Symbols like 1, 2, 3, 4, 5, etc.
• Counting: Saying numbers in order to find out "how many".
• Comparing: Finding which number is bigger or smaller.
• Ordering: Arranging numbers from smallest to biggest or biggest to smallest.

1. What are Numbers?

Numbers are symbols we use to count things. The first ten numbers are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

2. Counting Objects

We count objects to know how many there are. For example, if you have 3 apples, you count: 1, 2, 3.

3. Comparing Numbers

• If you have 5 pencils and your friend has 3 pencils, you have more pencils.
• If you have 2 candies and your friend has 4 candies, you have less candies.
• We use words like more, less, bigger, smaller to compare numbers.

4. Ordering Numbers

We can arrange numbers from smallest to biggest (1, 2, 3, 4, 5) or biggest to smallest (5, 4, 3, 2, 1).

5. Zero (0)

Zero means nothing. If you have 0 chocolates, you have none.

Fun Activity: Count and Color!

Count the number of apples, balls, or stars in your book and color them. Write the correct number next to each group.

Summary

• Numbers help us count and compare things.
• We use numbers every day in many ways.
• Zero means nothing.
• We can order numbers from smallest to biggest or biggest to smallest.

Practice Questions

Try these questions to test your understanding:

1. Write numbers from 1 to 10.
2. How many fingers do you have?
3. Which is bigger: 4 or 7?
4. What does zero mean?
5. Arrange these numbers in order: 3, 1, 5, 2, 4.

Challenge Yourself

• Count all the windows and doors in your house. Which is more?
• Make a number train by writing numbers from 1 to 20 in order.

Did You Know?

• The number zero (0) was invented in India!
• We use numbers for time, money, and even phone numbers.

Glossary

• Number: A symbol used for counting.
• Counting: Finding out "how many".
• Compare: To see which is more or less.
• Order: To arrange numbers in a sequence.
• Zero: Means nothing or none.

Answers to Practice Questions

1. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
2. 10
3. 7 is bigger than 4.
4. Zero means nothing.
5. 1, 2, 3, 4, 5

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Remember, numbers are everywhere! Use them to count, compare, and have fun learning!