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Class 9: science and maths

Every chapter, with tools to try: change a number, drag a point, run an experiment and see what happens. 94 tools so far, and more are on the way.

Science · Exploration

  1. 1 Exploration: Entering the World of Secondary Science

    Scientific method, SI units, significant figures, graphs

  2. 2 Cell: The Building Block of Life

    Cell theory, organelles, osmosis and diffusion

  3. 3 Tissues in Action

    Plant and animal tissues

  4. 4 Describing Motion Around Us

    Distance, velocity, acceleration, motion graphs, equations of motion

  5. 5 Exploring Mixtures and their Separation

    Solutions, colloids, suspensions, separation methods

  6. 6 How Forces Affect Motion

    Newton's laws, momentum, conservation of momentum

  7. 7 Work, Energy, and Simple Machines

    Work, kinetic and potential energy, power, machines

  8. 8 Journey Inside the Atom

    Atomic models, atomic number, isotopes, shells, valency

  9. 9 Atomic Foundations of Matter

    Laws of combination, formulae, molecular mass, the mole

  10. 10 Sound Waves: Characteristics and Applications

    Sound waves, frequency, pitch, echo, ultrasound, SONAR

  11. 11 Reproduction: How Life Continues

    Asexual and sexual reproduction

  12. 12 Patterns in Life: Diversity and Classification

    Classification, kingdoms, keys, names

  13. 13 Earth as a System: Energy, Matter, and Life

    Earth's spheres, carbon and nitrogen cycles, climate

Maths · Ganita Manjari

  1. 1 Orienting Yourself: The Use of Coordinates

    Cartesian plane, plotting points, distance

  2. 2 Introduction to Linear Polynomials

    Polynomials, zeros, linear graphs

  3. 3 The World of Numbers

    Rational and irrational numbers, decimals, exponents

  4. 4 Exploring Algebraic Identities

    Identities and factorising

  5. 5 I'm Up and Down, and Round and Round

    Rotations, angles, repeating patterns

  6. 6 Measuring Space: Perimeter and Area

    Areas, Heron's formula

  7. 7 The Mathematics of Maybe: Introduction to Probability

    Experiments, outcomes, probability

  8. 8 Predicting What Comes Next: Exploring Sequences and Progressions

    Patterns, sequences, arithmetic progressions

  9. 9 Propositions and their Converses

    Statements, proof, converse, counterexample

  10. 10 How Quantities Combine: Understanding Data

    Frequency tables, histograms, averages

  11. 11 The World of Algorithms

    Step-by-step methods, sorting, searching, Euclid's algorithm

  12. 12 Quadrilaterals

    Parallelograms, mid-point theorem

  13. 13 Two Variables, One Line

    Linear equations in two variables and their graphs

  14. 14 Math of Space: Surface Area and Volume

    Cubes, cylinders, cones, spheres

Other classes: Class 8 · Class 10 · Class 11 · Class 12

Chapters follow the topics of the NCERT books used in 2026-27 (the new books for Class 8 and 9, the 2023 rationalised books for Class 10 to 12). fibub is an independent free site, not part of NCERT, and copies no textbook text or pictures. Every tool runs in your browser: no sign-up, nothing about you is saved.