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Japanese Abacus : Its Use and Theory Takashi Kojima
Publisher: Charles and Tuttle Company

The Japanese Abacus: its Use and Theory. Abacus - Wikipedia, the free encyclopedia In Japanese, the abacus is. In sand or on tablets of wood, stone, or metal. In Tokyo in 1964 I bought a Soroban with Kojima's book "The Japanese Abacus: Its Use and Theory". The abacus was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants, traders and clerks in Asia, Africa, and elsewhere. Tomo 2: Advanced abacus, Japanese theory and practice. Kojima, Takashi (1954), The Japanese Abacus: its Use and Theory, Tokyo: Charles E. China leaping forward, and Japan experiencing phenomenal. Although electronic calculators are replacing it for practical reasons, the use of the abacus continues to be taught in technologically advanced countries such as Japan. The user of an abacus is called an abacist. An event that sparked my interest in abaci and in computers.