No textbook jargon. No skipped steps. Every lesson gives you a plain-English explanation, worked examples, practice problems, and links to go deeper. Pick a subject to start.
Variables, equations, functions, and the rules that govern them. The foundation of all higher mathematics.
Shapes, angles, area, volume, and the spatial reasoning behind them.
Data, probability, distributions, and how to draw conclusions from numbers.
Limits, derivatives, and integrals — the mathematics of change and accumulation.
Polynomials, trigonometry, logarithms, and sequences — the bridge to calculus.
Fractions, decimals, ratios, percentages, and number sense.
Most math explanations online fall into two traps. The first is the textbook trap: dense notation, assumed prerequisite knowledge, and worked examples that skip the intuitive reasoning and jump straight to manipulation. The second is the oversimplification trap: analogies that make things feel accessible but don't actually transfer to solving real problems.
Every lesson on Formula Hub is built around a simple question: what does a smart friend who knows this stuff really well actually say when they explain it? That usually means starting with why the concept exists and what problem it solves, before introducing the formal notation. It means showing every step in worked examples, including the reasoning behind each step — not just the mechanical operations. And it means being honest about what's tricky and where students commonly go wrong.
Each lesson follows the same structure. First, a plain-English explanation of the concept with a real-world analogy to build intuition. Then, the formal definition and notation. Then, fully worked examples with every step shown and explained. Then, a set of practice problems with answers you can reveal one at a time. Finally, curated links to Khan Academy, Desmos, Wikipedia, and other trusted resources for going deeper.
The lessons are designed to be read alongside the Formula Hub calculators. When a lesson covers a concept that has a calculator — like the quadratic formula, standard deviation, or compound interest — there's a direct link to try the numbers yourself. Seeing the formula produce real results helps cement the concept in a way that reading alone doesn't.