Monthly Problem - Math problems and solutions from Math Central.
Problem of the Fortnight - Twice-monthly problems with archive and solutions.
Math Forum: Problems of the Week - Projects from the Math Forum presenting weekly interactive math challenges to accumulate points for bronze, silver and gold prizes. Individual or class participation. Paid membership required to view problems.
Problem of the Week Links - Links to problems of the week sites organized by grade levels.
Ken Duisenberg's Puzzle of the Week - Problem archive and puzzle links.
Math Magic - Devoted to original mathematical recreations with puzzles and links.
Hamline University - Monthly problems.
Math Forum: Geometry Problem of the Week - Past archive and solutions. Receive help from mentor. Paid membership required to view problems.
Math Forum: Algebra Problem of the Week - Past archive and solutions. Receive help from a mentor. Paid membership required to view problems.
Problem of the Month - Posted by the Mathematics Department of Bilkent University.
John Handley High School Problem of the Week - Weekly math problem with solutions and archive.
Dansmath Problem of the Week - Weekly math problem, with solutions, archive, and leader board.
Bradley University Problem of the Week - Weekly math problem and archive from Professor Alberto L. Delgado.
Trent University Problem of the Week - Weekly math problems and solutions from Trent University.
Purdue University Problem of the Week - Weekly math challenge with past problem archives and solutions.
PuzzleUp - Weekly math problem with archive and scoreboard.
Baylor Problem of the Month - Monthly problems with archive and results.
Math Forum: Discrete Math Problems of the Week - Past problems and solutions, student recognition. Paid membership required to view problems.
Math Forum: Math Fundamentals Problem of the Week - A weekly interactive project for elementary school mathematics. Past problems, solutions, and student recognition. Paid membership required to view problems.
Mathematics Problem Solving Task Centres - Designed to assist teachers and students in problem solving. Includes problem of the month. Paid membership is required to view archived problems.
IBM Research Ponder This - A monthly on-line competition hosted by researchers at IBM.
Stony Brook Problem of the Month - Monthly math challenge with past problem archives and solutions, and hall of fame.
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