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Top 20 Directory:
Top : Science : Math : Recreations : Games_and_Puzzles : Problem_of_the_Week
Sites:
  		• Baylor Problem of the Month: Monthly problems with archive and results.
  		• Bradley University Problem of the Week: Weekly math problem and archive from Professor Alberto L. Delgado.
  		• Dansmath Problem of the Week: Weekly math problem, with solutions, archive, and leader board.
  		• Hamline University: Monthly problems.
  		• IBM Research Ponder This: A monthly on-line competition hosted by researchers at IBM.
  		• John Handley High School Problem of the Week: Weekly math problem with solutions and archive.
  		• Ken Duisenberg's Puzzle of the Week: Problem archive and puzzle links.
  		• Macalester College Problem of the Week: Weekly math problem and archive from Professor Stan Wagon for first-year college students presented by the Math Forum.
  		• Math Forum: Algebra Problem of the Week: Past archive and solutions. Receive help from a mentor. Paid membership required to view problems.
  		• Math Forum: Discrete Math Problems of the Week: Past problems and solutions, student recognition. Paid membership required to view problems.
  		• Math Forum: Geometry Problem of the Week: Past archive and solutions. Receive help from mentor. 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.
  		• 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.
  		• Math Magic: Devoted to original mathematical recreations with puzzles and links.
  		• 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.
  		• Monthly Problem: Math problems and solutions from Math Central.
  		• Ole Miss Problem of the Week Contest: A weekly contest for all students from elementary to high school. Prizes awarded each month.
  		• Problem of the Fortnight: Twice-monthly problems with archive and solutions.
  		• Problem of the Month: Posted by the Mathematics Department of Bilkent University.
  		• Problem of the Week Links: Links to problems of the week sites organized by grade levels.
  		• Purdue University Problem of the Week: Weekly math challenge with past problem archives and solutions.
  		• PuzzleUp: Weekly math problem with archive and scoreboard.
  		• Stony Brook Problem of the Month: Monthly math challenge with past problem archives and solutions, and hall of fame.
  		• Trent University Problem of the Week: Weekly math problems and solutions from Trent University.
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