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Ken Duisenberg's Puzzle of the Week
Problem archive and puzzle links.
ken.duisenberg.com/

John Handley High School Problem of the Week
Weekly math problem with solutions and archive.
www.pen.k12.va.us/

Purdue University Problem of the Week
Weekly math challenge with past problem archives and solutions.
www.math.purdue.edu/

Trent University Problem of the Week
Weekly math problems and solutions from Trent University.
euclid.trentu.ca/

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.
mathforum.org/

Bradley University Problem of the Week
Weekly math problem and archive from Professor Alberto L. Delgado.
bradley.bradley.edu/

Ole Miss Problem of the Week Contest
A weekly contest for all students from elementary to high school. Prizes awarded each month.
www.olemiss.edu/

Dansmath Problem of the Week
Weekly math problem, with solutions, archive, and leader board.
www.dansmath.com/

Problem of the Week Links
Links to problems of the week sites organized by grade levels.
www.wits.ac.za/

Calculus-Help Problem of the Week
Calculus based problems range from easy to difficult.
www.calculus-help.com/