Learn maths
Plain-English guides to the school maths topics that show up everywhere. Each article is self-contained, with worked examples and links to the relevant calculator.
Algebra basics
The grammar of algebra: variables, expressions, equations, and how to manipulate them without losing your footing.
Quadratic equations explained
Three ways to solve a quadratic, why the discriminant matters, and how the parabola tells the story visually.
Trigonometry basics
Sine, cosine, tangent, and the unit circle. Plus how the laws of sines and cosines unlock any triangle.
A friendly introduction to calculus
Limits, derivatives and integrals — what they are, why they were invented, and how they connect.
Geometry formulas you actually use
Areas, volumes, and surface areas of the eleven shapes that come up in 90% of school problems.
Statistics basics
Mean, median, mode, variance and standard deviation — what they really measure, with worked examples.
The order of operations (BIDMAS / PEMDAS)
A clear rule for unambiguous arithmetic, with the common mistakes laid out so you can avoid them.