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You have already learned about the number line and representation of various types of numbers in your earlier classes. In this chapter, you’ll study about rational and irrational numbers, descriptively. It gives in-depth exposure to Real Numbers and Their Decimal Expansions, Laws of Exponents for Real Numbers, Operations on Real Numbers and several other topics. Likewise, it talks about the contributions of the Greek mathematician and philosopher- Pythagoras, in irrational numbers; the German mathematicians – R. Dedekind and G. Cantor in the real number line; and the Greek genius – Archimedes for the decimal expansion of π (pi) and so forth.
A number r is called a rational number if it can be written in the form p/q, where p and q are integers and q ≠ 0.
A number s is called an irrational number, if it cannot be written in the form p/q, where p and q are integers and q ≠ 0 etc.
This particular chapter carries 8 marks in total in the final exam of class 9.
1.1 Introduction
1.2 Irrational Numbers
1.3 Real Numbers and Their Decimal Expansions
1.4 Representing Real Numbers on the Number Line
1.5 Operations on Real Numbers
1.6 Laws of Exponents for Real Numbers
1.7 Summary
Class 9 Maths Chapter 1 – Number Systems
A large number of examples accompanied by solutions and remarks are provided to deliver the clarity of concepts. Besides, figures and pictorial images are presented throughout the chapter to strengthen your knowledge, especially to help you solve the given exercises with ease.
To know more about the NCERT Solutions Class 9 Maths Chapter 1 – Number Systems, explore the exercises below. You can also download NCERT Class 9 Maths, Chapter 1 PDF below, solved by the expert Maths trainers. The given exercises are solved meticulously by experts, keeping in mind the learning requirements of students. Referring to it will not only accelerate your learning procedure but also manage your time effectively.
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