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World champion in mental calculation 🏆
The 14-Year-Old Human Calculator - Guinness World Records
Impossible Challenge: Teenagers mentally calculate 100 3-digit numbers in seconds
Cálculo Mental de Matemáticas 🧠📚⏰| Play Quiz de Cultura General
Impossible Challenge: Memorizing 1,100 numbers in 30 minutes!
Finger Mathematics - How to calculate Faster than a calculator Mental maths - 10
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