Learn O/L Maths

G.C.E. Ordinary Level · Grades 10–11

Pick a lesson to start learning it step by step.

O/L Maths

Indices & Logarithms
Powers, roots and logarithms, and the laws that connect them.
Binary Numbers
The base-2 number system used by computers.
Fractions, Ratios & Percentages
Working with parts of a whole and comparing quantities.
Number Patterns & Sequences
Spot the rule behind a pattern and predict what comes next.
Sets
Collections of objects and how to describe and combine them.
Interest, Rates & Taxes
Money maths for everyday life in Sri Lanka.
Algebraic Expressions & Factors
Expanding, simplifying and factorising expressions.
Equations & Inequalities
Find unknown values and describe ranges of values.
Graphs of Functions
Plot and read graphs of linear and quadratic functions.
Angles, Triangles & Parallels
Angle relationships and reasoning about shapes.
Circles
Circle theorems on chords, angles and tangents.
Constructions & Loci
Accurate drawing with ruler, protractor and compass.
Pythagoras & Trigonometry
Relating the sides and angles of right-angled triangles.
Perimeter & Area
Measuring the boundary and surface of flat shapes.
Surface Area & Volume
Measuring three-dimensional solids.
Statistics
Collect, display and summarise data.
Probability
Measure how likely events are.