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Lesson 1a - How to use the Abacus aka Soroban? Abacus Terminology.
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Abacus Tutorials | Lesson - Formula In Big Friend | Abacus Classes
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Impossible Challenge: Teenagers mentally calculate 100 3-digit numbers in seconds
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Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory
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Learn Abacus with Polymath-kids: Master Mental Math Skills
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Playing Video Games Can Be A Good Habit
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