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• Science: Math: Education: Events  (50)

This category in other languages:
	Polish  (7)   Spanish  (10)

• American Mathematics Competitions - Organization that administers the AMC, the AIME, and the USAMO, with information about the contests, math problem archives, recommended reading lists, and other resources for students interested in mathematics.
• Australian Mathematics Trust - Sponsors a number of competitions in the Australian continent.
• Crux Mathematicorum with Mathematical Mayhem - Problem-solving journal at the senior secondary and university undergraduate levels.
• Math Competitions in USA - Sample problems, information and links from multiple contests.
• Mathematics Archives - links to contests, problem sets, journals sites.
• Putnam Exam Information - Results from the Putnam competition, old exams, and problem archives. Includes problem of the day, selected from over 540 different Putnam, National or International Olympiad problems.
• Valentin Vornicu's MathLinks - Math Olympiad Problem Solving site with a weekly contest, resembling IMO in difficulty, with a large math forum and downloadable materials.