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Rekenrek Vs. Soroban II: Varied Strategies for the Same Calculation
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Elementary Soroban Arithmetic Techniques in Edo Period Japan | Mathematical Association of America
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Rekenrek Vs. Soroban I: Hand Analogy - Elementary Math
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What Abacus Should You Buy? – SumoMath Blog
Soroban – ALLEM
Soroban - Wikipedia
