Abacus Mental Arithmetic Ep.11 - Combo rules : +9,+8,+7,+6
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Abacus Mental Arithmetic Ep.12 - Combo rules : -9,-8,-7,-6
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Abacus Mental Arithmetic Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)
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Abacus # easy # visualization techniques # initial visualization # most awaited
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Learn Big Friend Addition Formula (+9 = +10 - 1)🤩|When & how to use (+9 = +10 - 1)🥰|Level 1 abacus 👆
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珠心算第三課 ［1️⃣ 10的組合減法口訣2️⃣ 手指算盤］
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though, thought, through, thorough, tough #sollyinfusion
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Soroban Japanese Abacus Basics (Multiplication)
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