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 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.
Problem of the Month - Posted by the Mathematics Department of Bilkent University.
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.