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Problem of the Week

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	IBM Research Ponder This - http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/pages/index.html A monthly on-line competition hosted by researchers at IBM.
	Purdue University Problem of the Week - http://www.math.purdue.edu/pow/ Weekly math challenge with past problem archives 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. Paid membership required to view problems.
	Math Forum: Geometry Problem of the Week - http://mathforum.org/geopow/ Past archive and solutions. Receive help from mentor. Paid membership required to view problems.
	Math Forum: Algebra Problem of the Week - http://mathforum.org/algpow/ Past archive and solutions. Receive help from a mentor. Paid membership required to view problems.

	Problem of the Month - http://www.fen.bilkent.edu.tr/~cvmath/Problem/problem.htm Posted by the Mathematics Department of Bilkent University.
	Math Magic - http://www.stetson.edu/~efriedma/mathmagic/ Devoted to original mathematical recreations with puzzles and links.
	Math Forum: Math Fundamentals Problem of the Week - http://mathforum.org/funpow/ A weekly interactive project for elementary school mathematics. Past problems, solutions, and student recognition. Paid membership required to view problems.
	Macalester College Problem of the Week - http://mathforum.org/wagon/ Weekly math problem and archive from Professor Stan Wagon for first-year college students presented by the Math Forum.
	Ken Duisenberg's Puzzle of the Week - http://ken.duisenberg.com/potw/ Problem archive and puzzle links.

	Bradley University Problem of the Week - http://bradley.bradley.edu/~delgado/potw/potw.html Weekly math problem and archive from Professor Alberto L. Delgado.
	PuzzleUp - http://www.puzzleup.com/ Weekly math problem with archive and scoreboard.
	Mathematics Problem Solving Task Centres - http://www.mav.vic.edu.au/members/problems.html Designed to assist teachers and students in problem solving. Includes problem of the month. Paid membership is required to view archived problems.
	Columbus State University - Problem of the Week Contest - http://www.colstate.edu/mathcontest/ A weekly contest for all students from elementary to high school. Prizes awarded each month.
	Dansmath Problem of the Week - http://www.dansmath.com/probofwk/probofwk.html Weekly math problem, with solutions, archive, and leader board.

	Trent University Problem of the Week - http://euclid.trentu.ca/math/dgp/potw_main.html Weekly math problems and solutions from Trent University.
	Problem of the Fortnight - http://persweb.wabash.edu/facstaff/axtellm/fortnight/fortnight.html Twice-monthly problems with archive and solutions.
	Stony Brook Problem of the Month - http://www.math.sunysb.edu/monthly-problem/ Monthly math challenge with past problem archives and solutions, and hall of fame.
	John Handley High School Problem of the Week - http://www.doe.virginia.gov/Div/Winchester/jhhs/math/probweek/probweek.html Weekly math problem with solutions and archive.
	Math Forum: Discrete Math Problems of the Week - http://mathforum.org/library/problems/discrete.html Past problems and solutions, student recognition. Paid membership required to view problems.

Monthly Problem - http://mathcentral.uregina.ca/MP/current/
Math problems and solutions from Math Central.

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