Never be bored with math again.
Free, open-source math from kindergarten to calculus — clear lessons, worked walkthroughs, and unlimited practice problems. No logins, no limits.
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Each track pairs lessons with step-by-step walkthroughs and endless practice.
Algebra I & II
Equations, functions, and graphing — from first variables to quadratics and beyond.
Open algebra →Geometry
Shapes, proofs, and the Pythagorean theorem with interactive figures.
Open geometry →Trigonometry
Angles, the unit circle, and the relationships that power waves and motion.
Open trig →Number Theory
Primes, divisibility, and modular arithmetic — the playground behind the puzzles.
Open number theory →Competitions
Prep for MATHCOUNTS, AMC 8, MOEMS and more — and try the daily olympiad problem.
Explore competitions →Glossary
Plain-language definitions for every term, linked straight back to the lessons.
Browse glossary →One problem at a time.
The full MathBored app tracks your streak, score, and accuracy as you practice — all on your device, nothing to sign up for.