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- Abacus Lesson -Multiplication-
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- Pisteet: 1 + 13 (5.0) Versio: 1.2.4 An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an ... ⥯
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