A little practice. A better solution.

Competition math problems, organized by subject and difficulty. Find a challenge, work it through, and learn from the solution.

Browse by subject

Equations, inequalities, polynomials, and sequences

Triangles, circles, coordinates, and transformations

Divisibility, primes, and modular arithmetic

Counting, graphs, games, and invariants

Choose a subject, difficulty, and reasoning style to find problems for your next session.

Try a problem on your own, then compare your reasoning with a worked solution.

New here? Start with a familiar subject. Our difficulty guide can help you choose a useful challenge.