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International Day of Mathematics 2025
Balls in an Urn
bewijs stelling van Pythagoras
Flip 4 Coins
Experiments with Transformations in the Plane
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day 110
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P.3 Division (4): 3-digit by 1-digit (with Decomposition)
Pythagorean Triples
Multiplying Numbers in Scientific Notation
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黎曼和（Riemann Sum）
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