Abacus Mental Math Ep.8 - Finger Abacus &10's rules : -5,-4,-3,-2,-1
Abacus Mental Math Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)
Abacus Mental Math Ep.9 - 5's rules : +4,+3,+2,+1
Abacus Mental Math Ep.4 - Adding and subtracting numbers on the Abacus without rules (中文 sub)
Abacus Mental Math Ep.7 - 10's rules : -9,-8,-7,-6
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Abacus Mental Math Ep.2 - How to read numbers and beads on an abacus (中文 sub)
Abacus Mental Math Ep.11 - Combo rules : +9,+8,+7,+6
Abacus Mental Math Ep.10 - 5's rules : -4,-3,-2,-1
Abacus Mental Math Ep.6 - 10's rules : +5,+4,+3,+2,+1 (中文 sub)
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Abacus Mental Math Ep.12 - Combo rules : -9,-8,-7,-6
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Abacus Mental Math Ep.13 - Review Common Rules
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