Class 9 Mathematics
Pick a chapter to see its topics and videos, in the order your textbook follows.
1Number SystemsRational and irrational numbers, decimals and the real number line.4 videos2PolynomialsPolynomials, their zeroes, the factor theorem and algebraic identities.Videos coming soon3Coordinate GeometryLocating points on a plane with x and y coordinates.1 video4Linear Equations in Two VariablesEquations like ax + by + c = 0, their solutions and graphs.Videos coming soon5Introduction to Euclid's GeometryEuclid's definitions, axioms and postulates.Videos coming soon6Lines and AnglesAngle pairs, parallel lines and a transversal.Videos coming soon7TrianglesCongruence rules and properties of triangles.Videos coming soon8QuadrilateralsParallelograms and the mid-point theorem.Videos coming soon9CirclesChords, arcs and angles in a circle.Videos coming soon10Heron's FormulaThe area of any triangle from its three sides.Videos coming soon11Surface Areas and VolumesSurface areas and volumes of cones, spheres and hemispheres.Videos coming soon12StatisticsOrganising data and drawing bar graphs and histograms.Videos coming soon
Coordinates: Chapter IntroductionTwo numbers pin any seat in an exam hall, and any point on a plane: coordinates turn geometry into numbers.Coordinate Geometry · Mathematics · simulation
Equivalent Fractions and Comparing Rational Numbers1 slice of 2 or 4 slices of 8: who ate more pizza? Learn equivalent fractions, the LCM trick for comparing, and why −3/4 > −5/6.Number Systems · Mathematics · simulation
Natural, Whole, Integers and Rational NumbersEach new family of numbers answers a question the old one could not, and every family lives inside the next: N ⊂ W ⊂ Z ⊂ Q.Number Systems · Mathematics
Rational Numbers on the Number LineTo place p/q, cut each unit into q equal parts and count p parts from 0: right for positive, left for negative.Number Systems · Mathematics · simulation
Terminating and Recurring Decimals1/4 = 0.25 stops, but 1/3 = 0.333… never does. The remainders of long division decide: a remainder of 0 stops it, a returning remainder makes it repeat.Number Systems · Mathematics · simulationNo topic matches. Try a shorter word.