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By Takashi Kojima

Uncomplicated and primitive although it appear, the japanese abacus is able to awesome pace and accuracy. in several checks it has outclassed the easiest electrical desktops of the Western global. the following for the 1st time in English is either an evidence of the secret and an entire publication of guide for using this notable pocket calculator.

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Inc. All rights reserved Library of Congress Catalog Card No. 55-3550 ISBN: 978-1-4629-0384-9 (ebook) First variation, April 1954 Thirty-third printing, 1990 revealed in Japan CONTENTS Foreword through Yoemon Yamazaki web page 7 Author's Foreword nine I. Abacus as opposed to electrical Calculator eleven II. short background of the Abacus 23 III. simple rules of Calculation 26 IV. Addition and Subtraction 31 V. Multiplication fifty three VI. department sixty four VII. Decimals eighty one VIII. psychological Calculation 87 workouts 88 FOREWORD It supplies me nice excitement that this publication in English at the abacus is prepared for booklet. eastern abacus operators have lengthy adored the will, the following eventually realised, of introducing the japanese abacus to different nations in view of the amazing advances and advancements that have been made within the tool and its use in the past region of a century. the japanese abacus, uncomplicated and primitive taking a look even though it's, will be operated with higher velocity and potency than even the electrical calculating machine—a truth confirmed in several checks and good documented via Mr. Kojima in his first bankruptcy. this is often particulary so moreover and subtraction, the place the abacus can deal with figures of any variety of digits two times as quickly because the electrical computer. to provide an explanation for the instrument's outstanding pace and mystifying potency it's crucial not just to introduce the most recent superior tools of operation but in addition to clarify the main complex theories of rational bases and of bead manipulation. In scripting this sensible booklet Mr. Kojima has saved those necessities good in brain. The Abacus examine Institute of the Japan Chamber of trade and has been such a lot happy to cooperate with him through making on hand its examine facts and correcting his manuscript within the gentle of the entire most recent details.

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