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Free, open-source online mathematics for students, teachers and workers
Warm-Up
GEOMETRY
The Blackboard and the Bend
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Touching Circles
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Triangular Billiard
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Bent Strip
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Two Points, One Circle and a Diameter
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A Tetrahedron through a Sheet of Paper
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Domino Tiling
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NUMBER THEORY
Primes and Numbers All Made by Ones
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Powers of 2
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ARITHMETIC