407,070 การดู
World champion in mental calculation 🏆
Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory
Dart Maths Made Easy
Impossible Challenge: Teenagers mentally calculate 100 3-digit numbers in seconds
Mental Math Tricks
I Learned Mental Math In 40 Hours
How I learned to Calculate Extremely Fast
Agile UCMAS Nepal - Abacus to Mental Math