THE JAPANESE ABACUS EXPLAINED

New York: Dover Publications, 1963. Cover designed by Theodore Menten. This Dover edition is an unabridged and unaltered republication of the work first published by Kyo Bun Kwan - Tokyo - in 1937. This volume also contains a new introduction by Martin Gardner. Contents: I). Abacus. II). Addition. III). Subtraction. IV). Multiplication. V). Division. VI). Division by abbreviation. The abacus, also called a counting frame, is a calculating tool used primarily in parts of Asia for performing arithmetic processes. Today, abaci are often constructed as a bamboo frame with beads sliding on wires, but originally they were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal. 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. The user of an abacus is called an abacist. XIII + 240 pag. . 1st edition. Paperback. Good copy/Cover in color. 21cmx13,5cm.