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Simple Soroban: Great App to Improve Your Mental Calculation – Roonby
2 Pack Soroban Abacus 13x7 Rods Math Tool
Mental Calculation demo on how to practice soroban - YouTube
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Japanese SOROBAN Calculation by Eiji Harada
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The Soroban Abacus was one of the calculation tools before the electric calculator was widely used in Japan. Yet, the Soroban Abacus has been an excellent educational tool for children to learn
Soroban.. The Japanese art of math calculations and….. babies?! — On raising a polyglot baby in the U.S. and multiplying his IQ