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Lesson 1a - How to use the Abacus aka Soroban? Abacus Terminology.
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Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory
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Soroban Memory Game
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Japan's ancient secret to better cognitive memory - BBC REEL
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Soroban Fun Series: EP 1
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Soroban EN
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Impossible Challenge: Teenagers mentally calculate 100 3-digit numbers in seconds
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Soroban olympic games
