Question

1) write about abacus ?​

Answer 1

An abacus is a manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame. The abacus itself doesn't calculate; it's simply a device for helping a human being to calculate by remembering what has been counted.

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Answer 2

The abacus is a calculating tool used primarily in parts of Asia for performing arithmetic processes. It is also called a counting frame. They were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal. Today, abacuses are often constructed as a bamboo frame with beads sliding on wires. 

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