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Authors: Sarah Vaughn, Sara Reich, David Hallatt, Jeffrey Huebner (Group 3) Category: Arithmetic, geometry, and logic Tags: math, addition, subtraction, multiplication, fractions, geometry, puzzles, tessellations, fractals Grade level use: 3 - 12 Topic/discipline: Math Tutorial Information: The website has different options for parents and teachers both. Possible uses: Drills, thinking skills Basic explanation: Individual practices their math and logic skills. Positives: A lot of possibilities. It makes math fun and challenging. Negatives: A lot of advertisements.