ISC Class 9Subject library

ISC Class 9 Mathematics

Chapter-wise notes, previous year papers, sample papers and Q&A for ISC Class 9 mathematics — free, syllabus-aligned, exam-ready.

12 chapters~410 min read totalFree · printable

Chapters

12 chapters — sequenced for revision and exam prep.

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Number Systems

From counting cows to imaginary numbers — how mathematicians extended the number line over 4000 years. Class 9 Number Systems with rationals, irrationals, real numbers, decimal expansions, the number line, surds, rationalisation, and 30+ exam-style problems.

CBSE⏱ 45 minRead chapter

Polynomials

From counting apples to encoding all of algebra — polynomials are the words of mathematics. Class 9 Polynomials with one-variable polynomials, degree, zeros, the Remainder & Factor Theorems, identities for factorisation, and 25+ exam-style problems with full step-by-step solutions.

CBSE⏱ 45 minRead chapter

Coordinate Geometry

From Descartes' fly on the ceiling to plotting your own GPS — Class 9 Coordinate Geometry, taught the way a great teacher would. Cartesian plane, quadrants, plotting, reflections, distance along axes, real-world uses and 30+ worked problems.

CBSE⏱ 35 minRead chapter

Linear Equations in Two Variables

Every train timetable, every demand-and-supply curve, every flight path — they're all linear equations in two variables. Class 9 chapter on solutions, plotting, slope-intercept ideas, geometric meaning, axis-equations, and real-world applications with 25+ worked exam problems.

CBSE⏱ 40 minRead chapter

Introduction to Euclid's Geometry

How a Greek geometer in 300 BCE built all of geometry from five axioms and five postulates — and why it took 2000 years to spot the loophole in his fifth one. Class 9 introduction to deductive reasoning, Euclid's definitions, postulates, axioms, theorems, and 20+ worked exam problems.

CBSE⏱ 30 minRead chapter

Lines and Angles

Every triangle, every quadrilateral, every polygon — they're all just collections of lines and angles. This is the foundation chapter for the rest of Class 9 geometry. Vertically opposite angles, linear pairs, parallel-line angle pairs, the angle sum of a triangle — proved rigorously, with 25+ exam-style problems.

CBSE⏱ 40 minRead chapter

Triangles

The triangle is the strongest shape in nature and the most studied object in geometry. Class 9 chapter on congruence (SSS, SAS, ASA, AAS, RHS), isosceles triangle theorem, inequalities, and 25+ exam problems with full proofs.

CBSE⏱ 45 minRead chapter

Quadrilaterals

Most shapes you'll ever draw are quadrilaterals — a screen, a door, a phone, a notebook. Class 9 chapter on parallelograms, rectangles, rhombuses, squares, trapezia, plus the Mid-Point Theorem — all proved using triangle congruence. 25+ exam-style problems with full step-by-step solutions.

CBSE⏱ 40 minRead chapter

Circles

The circle is the most symmetric shape — and that symmetry produces a cascade of beautiful theorems. Class 9 chapter on chords, arcs, angles subtended, cyclic quadrilaterals — the foundation of trigonometry, calculus, and physics. 25+ exam problems with full step-by-step proofs.

CBSE⏱ 40 minRead chapter

Heron's Formula

How a 1st-century Greek engineer computed the area of any triangle from just its three sides — no height needed. The most useful single formula in surveying. Class 9 chapter with derivation, applications to quadrilaterals, and 20+ worked exam problems.

CBSE⏱ 25 minRead chapter

Surface Areas and Volumes

Formulas for the surface area and volume of cuboids, cubes, cylinders, cones, spheres and hemispheres — and how to mix and match them in composite-solid problems.

CBSE⏱ 14 minRead chapter