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Karnataka Board Class 9 Mathematics — Revision Notes

Karnataka Board Class 9 Mathematics revision notes, chapter by chapter across 12 chapters. Starts with Number Systems, Triangles and Polynomials.

How to Revise Effectively

  • Active recall: cover the notes, try to recall the key points, then check.
  • Spaced repetition: revise each chapter again after a day, then after a few days, then after a week or two.
  • Write, don't just read: writing key points and formulas out by hand helps them stick.
  • Teach someone: explaining an idea to a friend is a good test of whether you understand it.

Chapter-Wise Revision Notes — 12 Chapters

1

Number Systems

4 topics
  • 1. Classification of Numbers
  • 2. Finding Rational Numbers Between Given Numbers
  • 3. Representation of Numbers on Number Line
  • 4. Decimal Expansions of Rational Numbers
Numbers are classified intoA rational number can be writtenNumbers that cannot be expressed asThree typesKey rules
Read the Number Systems notes
2

Triangles

4 topics
  • Congruence of Triangles - Fundamental Concepts
  • SAS Congruence Rule - Side-Angle-Side
  • ASA and AAS Congruence Rules - Angle-Side-Angle and Angle-Angle-Side
  • SSS Congruence Rule - Side-Side-Side
Two figures are congruent if theyIf two sides and the includedIf two angles and the includedIf two angles and one sideIf all three sides of one
Read the Triangles notes
3

Polynomials

4 topics
  • Introduction to Polynomials
  • Types of Polynomials
  • Zeros of a Polynomial
  • Remainder Theorem
A polynomial p(x) = aₙxⁿ +To find p(a)A zero of polynomial p(x)Factor TheoremKey identities with step
Read the Polynomials notes

9 more chapters below

Revision notes with diagrams and examples for all 12 chapters in Super Tutor.

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Frequently Asked Questions

Where can I find Karnataka Board Class 9 Mathematics Revision Notes?

This page has revision notes for 12 chapters of Karnataka Board Class 9 Mathematics for the 2026-27 session. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Browse Revision Notes by Chapter

12 chapters

1

Number Systems

2

Triangles

3

Polynomials

4

Quadrilaterals

5

Coordinate Geometry

6

Circles

7

Linear Equations in Two Variables

8

Heron's Formula

9

Introduction to Euclid's Geometry

10

Surface areas and Volumes

11

Lines and Angles

12

Statistics

More Mathematics Resources

Karnataka Board Class 9

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Formula Sheet

The formulas of each chapter in one place

Chapter Summary

Understand each chapter at a glance

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

Other Karnataka Board Class 9 Subjects

ScienceSocial SciencePhysical Education