Maths Chapter 2: Number System, Class 9 CBSE

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Questions and Answers

Which of the following is an irrational number?

  • 22/7
  • 3.14 (correct)
  • 5/2
  • 22

The sum of a rational and an irrational number is always irrational.

True (A)

Simplify the expression: $(2 + \sqrt{3})(2 - \sqrt{3})$

1

Every real number is either __________ or irrational.

<p>rational</p> Signup and view all the answers

Match the following numbers with their classification:

<p>22/7 = Rational 3.14 = Irrational 5/2 = Rational π = Irrational</p> Signup and view all the answers

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Study Notes

Properties of Irrational Numbers

  • The sum of a rational and an irrational number is always irrational.

Simplification of Expressions

  • $(2 + \sqrt{3})(2 - \sqrt{3})$ can be simplified.

Classification of Real Numbers

  • Every real number is either rational or irrational.

Classification of Numbers

  • Match numbers with their classification: rational or irrational.

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