Stony Brook Problem of the Month
math.sunysb.edu
Monthly math challenge with past problem archives and solutions, and hall of fame.
Dansmath Problem of the Week
dansmath.com
Weekly math problem, with solutions, archive, and leader board.
Math Forum: Discrete Math Problems of the Week
mathforum.org
Past problems and solutions, student recognition. Paid membership required to view problems.
John Handley High School Problem of the Week
doe.virginia.gov
Weekly math problem with solutions and archive.
Trent University Problem of the Week
euclid.trentu.ca
Weekly math problems and solutions from Trent University.
Ken Duisenberg's Puzzle of the Week
ken.duisenberg.com
Problem archive and puzzle links.- Math Forum: Math Fundamentals Problem of the Week
mathforum.org
A weekly interactive project for elementary school mathematics. Past problems, solutions, and student recognition. Paid membership required to view problems. 
Columbus State University - Problem of the Week Contest
colstate.edu
A weekly contest for all students from elementary to high school. Prizes awarded each month.- Math Forum: Algebra Problem of the Week
mathforum.org
Past archive and solutions. Receive help from a mentor. Paid membership required to view problems. 
IBM Research Ponder This
domino.research.ibm.com
A monthly on-line competition hosted by researchers at IBM.
Math Magic
stetson.edu
Devoted to original mathematical recreations with puzzles and links.- Math Forum: Problems of the Week
mathforum.org
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. 
Monthly Problem
mathcentral.uregina.ca
Math problems and solutions from Math Central.
Mathematics Problem Solving Task Centres
mav.vic.edu.au
Designed to assist teachers and students in problem solving. Includes problem of the month. Paid membership is required to view archived problems.
Purdue University Problem of the Week
math.purdue.edu
Weekly math challenge with past problem archives and solutions.
PuzzleUp
puzzleup.com
Weekly math problem with archive and scoreboard.- Macalester College Problem of the Week
mathforum.org
Weekly math problem and archive from Professor Stan Wagon for first-year college students presented by the Math Forum. 
Problem of the Month
fen.bilkent.edu.tr
Posted by the Mathematics Department of Bilkent University.
Bradley University Problem of the Week
bradley.bradley.edu
Weekly math problem and archive from Professor Alberto L. Delgado.
Problem of the Fortnight
persweb.wabash.edu
Twice-monthly problems with archive and solutions.
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