Abacus is the most ancient tool used for the purpose of calculations. It consists of a frame with rods or wires, on which spheres are beaded. The value of the spheres depends on the rod, on which they are beaded: units, tens, hundreds, and so on. By moving the balls one can do the four simple mathematical operations as well as more difficult calculations. The result can then be read from the position of the balls. Abacus is used even today in some countries of retailers, such as China and Russia.
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