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Chapter 1 Number Systems NCERT Book Class 9 PDF (2026-27)
(A) Main Concepts and Results
Rational numbers
Irrational numbers
Locating irrational numbers on the number line
Real numbers and their decimal expansions
Representing real numbers on the number line
Operations on real numbers
Rationalisation of denominator
Laws of exponents for real numbers
• A number 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 which cannot be expressed in the form p/q (where p and q are integers and q ≠ 0) is called an irrational number.
• All rational numbers and all irrational numbers together make the collection of real numbers.
• Decimal expansion of a rational number is either terminating or non-terminating recurring, while the decimal expansion of an irrational number is non-terminating non-recurring.
Please refer to attached file for NCERT Class 9 Maths Number Systems Questions
Free study material for Mathematics
NCERT Book for Class 9 Mathematics Chapter 1 Number Systems
Official NCERT E-Textbook: Chapter 1 Number Systems (NCERT)
Obtain the official NCERT Textbook for Class 9 Mathematics Chapter 1 Number Systems, structured for active learning sessions. Subject teachers and academic experts consistently advise using the Chapter 1 Number Systems e-textbook because all terminal tests for Class 9 follow its prescribed curriculum closely. Retrieve your complete chapter resource securely in PDF format from this page.
Complete Chapter E-Books for Class 9 Mathematics
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