Core
Integers, Powers & Roots
Rational and irrational numbers, estimating roots, the index laws and fractional indices.
The Thai Guy · Mathematics
Year 9 Maths,
worked out properly.
16 topics across the three strands, 69 lessons with step-by-step worked solutions, and hundreds of practice questions that mark themselves and explain where you went wrong.
- 16 topics
- 69 lessons
- 16 scored quizzes
Where you are
Number & Algebra
Working with numbers in every form, then letting letters stand in for them: indices, standard form, fractions, equations, sequences, proportion and percentages.
Core
Expressions & Formulae
Simplifying, algebraic fractions, expanding brackets, substitution and rearranging formulae.
Core
Place Value & Standard Form
Multiplying and dividing by powers of ten, standard form, and upper and lower bounds — including bounds in calculations.
Core
Fractions & Decimals
Factors, multiplying and dividing fractions, order of operations, and recurring decimals — including the algebraic method.
Core
Equations & Inequalities
Building and solving linear equations, inequalities, gradients and simultaneous equations.
Core
Ratio & Proportion
Solving ratio problems, direct proportion and inverse proportion.
Core
Sequences, Functions & Graphs
Term-to-term and nth term rules, functions, straight-line graphs and reading real-life graphs.
Core
Decimals & Percentages
Estimation, multiplying and dividing decimals, compound percentage change, reverse percentages and percentage error.
Challenge Extension
Quadratics
Expanding, factorising and solving quadratics, sketching their graphs, and where a line meets a curve.
Measurement & Geometry
Shape, space and size: circles, Pythagoras, surface area and volume, angles in polygons, constructions and transformations.
Core
Shapes & Mathematical Drawings
Inscribed polygons, ruler-and-compass constructions, scales, bearings, and symmetry in 3D.
Core
Area, Perimeter & Volume
Circles, Pythagoras’ theorem, surface area and volume, units of area and volume, similar solids, and compound units.
Core
Geometry
Angles in polygons, tessellations, multi-step angle problems and coordinates on a line segment.
Core
Transformations
Enlargement, describing single transformations, and combining them.
Statistics & Probability
Collecting and summarising data, choosing the right graph to tell its story, and measuring how likely things are to happen.
Core
Grouped Data & Sampling
Averages and range from grouped frequency tables, and how to take a fair sample.
Core
Presenting Data & Interpreting Results
Frequency polygons, back-to-back stem-and-leaf diagrams, scatter graphs and choosing the right chart.
Core
Probability
Combined events, sample space diagrams, tree diagrams and experimental probability.
How each lesson works
- 1
Read the overview
What the idea is, why it matters, and the rules and formulas you need.
- 2
Work the examples
Try it yourself, then reveal the solution one step at a time — not all at once.
- 3
Practise
Fourteen kinds of question, marked instantly, with a hint when you are stuck.
- 4
Take the quiz
A scored paper that mixes question types, then a full review of every answer.