abacus used a series of moveable
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The Japanese abacus consists of vertical rods arranged in series and the movable beads on each vertical rod. ... The Japanese abacus is used for counting the numbers and for performing the operations such as addition, multiplication, subtraction, and division at high speed.
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The Japanese abacus consists of vertical rods arranged in series and the movable beads on each vertical rod. ... The Japanese abacus is used for counting the numbers and for performing the operations such as addition, multiplication, subtraction, and division at high speed
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