12:29

Abacus Mental Arithmetic Ep.12 - Combo rules : -9,-8,-7,-6

12:20

Abacus Mental Arithmetic Ep.7 - 10's rules : -9,-8,-7,-6

6:08

Learn to use the abacus(soroban), the Japanese way - Part 1

10:27

Abacus Mental Arithmetic Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)

9:04

珠心算初級班第4堂課

15:21

Abacus Mental Arithmetic Ep.10 - 5's rules : -4,-3,-2,-1

15:15

Abacus Mental Arithmetic Ep.8 - Finger Abacus &10's rules : -5,-4,-3,-2,-1

9:55

珠心算第三課 ［1️⃣ 10的組合減法口訣2️⃣ 手指算盤］