Abacus is an ancient calculating device having its roots in Asia since ages. Abacus in today’s times time is made of wood, metal or plastic rectangular frame with freely sliding 5 beads over vertical rods. These beads are parted by an at-least fixed horizontal bar where 1 bead over the vertical bar is placed above the fixed horizontal bar and the remaining 4 beads below the fixed horizontal bar. The beads above the fixed horizontal bar represent number 5 whereas other each of the 4 beads below represents number 1.