FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The Chinese abacus, also known as the suanpan (/, lit. “calculating tray"), comes in various lengths and widths, depending on the operator. It usually has more than seven rods. There are two beads on each rod in the upper deck and five beads each in the bottom one.

Detailed explanation-2: -Ancient Mesopotamians of Sumeria invented Abacus between and BC.

Detailed explanation-3: -The abacus has been in existence in China since the second century BCE, although the oldest counting boards have been found in fourth century BCE Rome. Many cultures used abaci or something similar (such as the Inca quipu).

Detailed explanation-4: -Within the frame are at least nine vertical rods strung with moveable beads. A horizontal crossbar perpendicular to the rods separates the abacus into two unequal parts. The beads above the crossbar are known as heaven beads, and those below the crossbar are called earth beads.