PhET
Interactive science and math simulations for learning by experiment
Explore mathematics with interactive courses and activities

Mathigon teaches mathematics through interactive courses, activities, and visual tools. Learners explore subjects such as fractals, sequences, graph theory, symmetry, and origami. Changing objects and testing examples make relationships available to investigate during a lesson.
Teacher resources support classroom use, while activities can also be approached as open-ended problems. Polypad, the related virtual-manipulative environment, has moved to Amplify and remains linked from the site. The courses and tools provide ways to work through a mathematical idea visually, with students examining a pattern or relationship before comparing their conclusions with the lesson material.
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