Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory
Lesson 4 - Introduction to Abacus Mental Math
Abacus Mental Math
Introduction to Mental Math using the Abacus
Abacus Mental Math Ep.4 - Adding and subtracting numbers on the Abacus without rules (中文 sub)
Amazing abacus addition by Japanese girl, age 7
Finger Abacus level 1|Addition and subtraction with the help of fingers#short#abacus#fingermath
Japan's ancient secret to better cognitive memory - BBC REEL
Abacus mental math
Impossible Challenge: Teenagers mentally calculate 100 3-digit numbers in seconds
Abacus Mental Math Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)