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World champion in mental calculation 🏆
Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory
How I learned to Calculate Extremely Fast
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How to Calculate Faster than a Calculator - Mental Maths #1
Mental Addition and Subtraction Tips — Math Tricks with Arthur Benjamin
60%÷10% = ?% The answer is not 6. Only for smart ones! American Math Olympiad #percentages
Fast Math - Mental Calculation - An Android mobile game