Chapter 3: The World of Numbers
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About Chapter 3 (The World of Numbers)
Chapter 3 (The World of Numbers) is chapter 3 of 14 in the new edition of Ganita Manjari (NCERT Class 9 Mathematics), a textbook for Class 9 students at the Secondary stage. This is the new edition, the textbook brought out under the NEP 2020 / NCF-SE 2023 syllabus rollout.
In the book it comes after Chapter 2 (Introduction to Linear Polynomials) and before Chapter 4 (Exploring Algebraic Identities), so it helps to be comfortable with the earlier chapters before starting it.
What you will find on NCERT Archive
NCERT Archive is our dedicated site for NCERT textbooks and solutions, Class 1 to 12. The page for Chapter 3 (The World of Numbers) there lets you read the chapter and open its textbook PDF, and it links straight to the solutions for the same chapter. Use the buttons above to go to it.
How to study The World of Numbers
- Read the worked examples before the exercises and copy out each step in your own hand.
- Attempt every exercise question yourself first; open the solution only to check your method or when you are stuck.
- Keep a short list of formulas and definitions from the chapter and revise it before tests.
- Redo the questions you got wrong after a day or two, without looking at the solution.
Frequently Asked Questions
Which book is Chapter 3 (The World of Numbers) of Class 9 Mathematics from?
It is from the new edition of Ganita Manjari (NCERT Class 9 Mathematics). The book has 14 chapters, and this is chapter 3.
Where can I read Chapter 3 (The World of Numbers) of Class 9 Mathematics?
On NCERT Archive. Press the "Open Chapter 3" button on this page and you will land on the chapter page there, where you can read it and open its textbook PDF.
Is this the new edition or the old edition?
This page is for the new edition. If your school still uses the earlier textbook, use the Old Edition switch at the top of the page.
Is it free to use?
Yes. Scholar Donkey and NCERT Archive are free to use and need no login.