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By around 1880 most people had switched to this style from the older Chinese style. This was because one 5-bead and four 1-beads were considered
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By around 1880 most people had switched to this style from the older Chinese style. This was because one 5-bead and four 1-beads were considered
Large Abacus Soroban Japanese Virtual Classroom Math Teaching Aid Rare Size
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How does mental arithmetic help a child's brain? - Quora
Is the abacus still used in Japan? How difficult is it to use? - Quora
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PDF) EFFECTS OF USING THE JAPANESE ABACUS METHOD UPON THE ADDITION AND MULTIPLICATION PERFORMANCE OF GRADE 3 INDONESIAN STUDENTS
