Interactive Mathematics Miscellany and Puzzles
cut-the-knot.org
An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles
A long-running personal project by Alexander Bogomolny, offering hundreds of interactive math puzzles, geometric demonstrations, and expository articles. The site covers topics from arithmetic to advanced geometry, making it useful for both students and enthusiasts. Its depth and coherence come from decades of careful curation.
Checked with Google Web Risk · 2 days ago
- language
- EN
- here since
- July 2026