Library
Look it up, understand it, practise it
Each formula is a small lesson: what every letter means, why it works, other forms, and worked examples from easy to exam level. Every one is checked by a computer algebra system.
Formulas63 formulas in 14 topics, Class 9 maths firstGlossary220 terms explained simply and precisely, with examplesSymbols186 symbols: how to say each one, what it means, an exampleTricks30 mental maths tricks, why each works, and a game to practise itCalculators12 calculators that show their working, step by stepTablesTimes tables to 30, squares, cubes, roots and powers: learn, test, practise