The abacus is a most ancient calculating device . It consists of a wooden frame, rods, and beads. Each rod represents a different place value—ones, tens, hundreds, thousands, and so on. Each bead represents a number, usually 1 or 5. We can perform addition and subtraction easily by moving beads along the wires of the abacus.
In short ABACUS is a simple tool used for fast and accurate calculations. ABACUS helps develop right brain and overall intelligence. There are many other benefits, just to name few, it helps improve,
Mental calculation abilities & whole brain development