Interesting Math History

Question :
What is an 'Abacus' ?

Answer :
The Abacus is a counting frame to aid in Arithmetic Computation - largely used in China and Japan.
A simple form of Abacus consists of a series of parallel wires or rods fastened in a wooden frame. There are counters or beads which are moved along each rod. The position of each rod represents a certain place value.
An abacus is a calculating tool mostly used by Asians for performing arithmetic calculations. It is also called a counting frame. They were originally made of beads or stones. The abacus was in use centuries before the adoption of the written modern numeral system.
The word Abacus is derived from the Greek word Abax, means a table or a board covered with dust. The origins of the Abacus lies in the Middle East some where in early middle ages.
Abacus was often constructed as a wooden frame with beads sliding on wires.
The person who uses the abacus is called an abacist. It is used for addition and subtraction, and the related operations of multiplication and division.