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Is this the first wearable computer? 300-year-old Chinese abacus ring was used during the Qing Dynasty to help traders | Daily Mail Online
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Soroban abacus and finger math - Natural Math
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Learn To Count 0 to 20 with the help of Abacus and Finger Abacus - Finger Abacus - Count on Abacus - YouTube | Abacus, Learn to count, Abacus math
Soroban abacus and finger math - Natural Math
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