- Monthly Problem - http://mathcentral.uregina.ca/MP/current/
Math problems and solutions from Math Central.
- Problem of the Fortnight - http://persweb.wabash.edu/facstaff/axtellm/fortnight/fortnight.html
Twice-monthly problems with archive and solutions.
- Math Forum: Problems of the Week - http://mathforum.org/pow/
Projects from the Math Forum presenting weekly interactive math challenges to accumulate points for bronze, silver and gold prizes. Individual or class participation.
- Problem of the Week Links - http://www.wits.ac.za/ssproule/pow.htm
Links to problems of the week sites organized by grade levels.
- IBM Research Ponder This - http://www.research.ibm.com/ponder/index.shtml
A monthly on-line competition hosted by researchers at IBM.
- Math Magic - http://www.stetson.edu/~efriedma/mathmagic/
Devoted to original mathematical recreations with puzzles and links.
- Problem of the Week - http://www.shepherd.edu/mathweb/problems.html
Sponsored by Shepherd College.
- Hamline University - http://www.hamline.edu/~math/aguetter/pom/prob_of_month.html
Monthly problems.
- AIMS Puzzle Corner - http://www.aimsedu.org/puzzle/
Provides monthly puzzles with the goal of creating an engaging learning environment.
- Problem of the Month - http://www.fen.bilkent.edu.tr/~cvmath/Problem/problem.htm
Posted by the Mathematics Department of Bilkent University.
- The Little Math Puzzle - http://www.sprucelog.com/lmp/
The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete archives of past problems.
- Dansmath Problem of the Week - http://www.dansmath.com/probofwk/probofwk.html
Weekly math problem, with solutions, archive, and leader board.
- Weekly Math Problem USNA - http://www.usna.edu/MathDept/mathdept/weeklycontest.html
Problems from the United States Naval Academy, also includes archives and solutions.
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