NCERT Class 9 Maths Chapter 1 Notes Number System - Download Free PDF

Students can find Number System class 9 notes here. These Notes are created by expert team at careers360 considering the need of students. Number System is the NCERT chapter that deals with different types of numbers. The NCERT Class 9 Maths Chapter 1 Notes contains systematic explanations of topics using examples and exercises. Number System class 9 notes include FAQ’s or frequently asked questions about the chapter. Class 9 maths chapter 1 notes topics are explained step by step. CBSE class 9 maths chapter 1 notes can also be downloaded from Number System class 9 notes pdf download.

Also, students can refer,

• NCERT Class 9 Maths Notes
  
• NCERT Solutions for Class 9 Maths Chapter 1 Number System
• NCERT Exemplar Class 9 Maths Chapter 1 Solutions Number System

NCERT Class 9 Maths Chapter 1 Notes

1. Natural Numbers: Positive or non-negative integers that start from 1 to infinity are called natural numbers. It is represented by ‘N’.
N = {1, 2, 3 ,......}

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2. Whole Numbers: Numbers that exclude fractions and include positive integers and zero. It is represented by ‘W’.
W = {0, 1, 2, 3, ......}

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3. Integers: The collection of all whole numbers and negative numbers are integers, together called integers. It is represented by ‘Z’ or ‘I’.
Z or I = {...... –2, –1,0,1,2,3 ......}

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4. Rational Number: Numbers that can be expressed in p/q form where q≠o and p, q∈Z are rational numbers. It is represented by ‘Q’.

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5. Irrational Number: Real numbers that can’t be expressed as a simple fraction are irrational numbers.

6. Number Line:

• Rational numbers are defined as the number whose decimal expansion is either terminating or non-terminating recurring.
• In the case of irrational numbers, the decimal expansion is non-terminating and non-recurring.
• Real numbers are the collection of both rational numbers and irrational numbers.
• An irrational number is the sum of rational numbers and irrational numbers.
• Irrational numbers are the product of non-zero rational numbers and irrational numbers.
• The product of two irrational numbers need not be an irrational number always.
• Suppose ‘a’ is a rational number and n is a positive integer then the nth root of ‘a’ is an irrational number, then a^1/n is called a surd.
• A real number is either a rational number or an irrational number.
• All irrational numbers can be represented number line using the Pythagoras theorem.
• Rationalization means to remove the square root from the denominator in p/q.

Significance of NCERT class 9 maths chapter 1 notes

Understanding the notes from Number Syatem class 9 notes is crucial because it forms the foundation for the rest of your mathematical journey. These class 9 maths chapter 1 notes introduce fundamental concepts and principles that are building blocks for more advanced topics. Number System notes class 9 lays the groundwork for developing problem-solving skills and a strong mathematical base.

Key points covered in cbse class 9 maths ch 1 notes include basic arithmetic operations, number systems, and an introduction to algebraic expressions. Mastering these concepts is essential as they are often used in more complex mathematical problems in higher classes.

By grasping the significance of ch 1 maths class 9 notes, students gain a solid understanding of mathematical concepts, making it easier to tackle advanced topics in subsequent grades. It's like constructing a sturdy house – a strong foundation ensures stability and success in the long run. Students can download maths class 9 chapter 1 notes pdf using the link given above in this article.

NCERT Class 9 Notes Chapter wise

NCERT solutions of class 9 subject wise

• NCERT solutions for class 9 Maths
• NCERT solutions for class 9 Science

NCERT Class 9 Exemplar Solutions for Other Subjects:

• NCERT Exemplar Class 9 Maths solutions
• NCERT Exemplar Class 9 Science solutions