Abacus Mental Arithmetic Ep.4 - Adding and subtracting numbers on the Abacus without rules (中文 sub)
10:27
Abacus Mental Arithmetic Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)
8:24
Abacus Mental Arithmetic Ep.2 - How to read numbers and beads on an abacus (中文 sub)
6:17
Japan's ancient secret to better cognitive memory - BBC REEL
3:29
Abacus Tutorial: 1 Basic function
7:23
Learn Big Friend Addition Formula (+9 = +10 - 1)🤩|When & how to use (+9 = +10 - 1)🥰|Level 1 abacus 👆
10:10
Abacus Mental Arithmetic Ep.6 - 10's rules : +5,+4,+3,+2,+1 (中文 sub)
13:23
Chinese Abacus: Counting
12:58