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Abacus Mental Arithmetic Ep.4 - Adding and subtracting numbers on the Abacus without rules (中文 sub)
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Abacus Mental Arithmetic Ep.8 - Finger Abacus &10's rules : -5,-4,-3,-2,-1
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Abacus Mental Arithmetic Ep.6 - 10's rules : +5,+4,+3,+2,+1 (中文 sub)
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Abacus Mental Arithmetic Ep.10 - 5's rules : -4,-3,-2,-1
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Abacus Mental Arithmetic Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)
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#Multiplication on the #Abacus Basic tech.no. 2 short video watch full episode to learn in
