- AIMS Puzzle Corner - - Provides monthly puzzles with the goal of creating an engaging learning environment.
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- The Little Math Puzzle - - The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete archives of past problems.
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- 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.
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- Math Magic - - Devoted to original mathematical recreations with puzzles and links.
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- PuzzleUp - - Weekly math problem with archive and scoreboard.
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