Abacus

The abacus, also called a counting frame. An abacus is a manual aid to calculating that consists of disks (beads) that can be moved up and down on a chain 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. 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.

 Abacus helps you keep track of everything. Often used for performing arithmetic processes, mathematics, writing and recorded information. Long before the computer, in the Roman Empire, Ancient Asia, and other parts of the world, people started inventing easier and faster ways of counting and calculating by using abacus.                                              

                   Here is How Abacus Works, and How is it Used.