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Chapter 1 Class 9 Number Systems

Get solutions of all NCERT Questions of Chapter 1 Class 9 Number System free at teachoo. Answers to all NCERT Exercises and Examples are solved for your reference. Theory of concepts is also made for your easy understanding


In this chapter, we will learn

  • Different Types of numbers like Natural Numbers, Whole numbers, Integers, Rational numbers
  • How to find rational numbers between two rational numbers
  • What is an irrational number
  • Checking if number is irrational or not
  • And how to draw an irrational number on the number line
  • Then, we will study What a real number is
  • And find Decimal expansions - Terminating, Non terminating - repeating, Non terminating Non repeating
  • Converting non-terminating repeating numbers into p/q form
  • Finding irrational numbers between two numbers
  • Representing real numbers on the number line (we use magnification)
  • We will learn how to add, subtract and multiply numbers with square root (like 5√2 + 3√3 - 8√2)
  • We will learn some identities of numbers with square root (like (√a + √b)2)
  • How to rationalize numbers
  • We will also do questions on Law of Exponents (here, the exponents can also be in fractions)


Click on an NCERT Exercise below to get started. 

Or you can also check the concepts from the Concept wise. Check it out now


Serial order wise

  Ex 1.1
  Ex 1.2
  Ex 1.3
  Ex 1.4
  Ex 1.5
  Ex 1.6

Concept wise