FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The abacus, called Suan-Pan in Chinese, as it appears today, was first chronicled circa 1200 C.E. in China. The device was made of wood with metal re-inforcements. On each rod, the classic Chinese abacus has 2 beads on the upper deck and 5 on the lower deck; such an abacus is also referred to as a 2/5 abacus.

Detailed explanation-2: -Mesopotamia. The Sumerian abacus appeared between 2700 and 2300 BC.

Detailed explanation-3: -The earliest known calculating device is probably the abacus. It dates back at least to 1100 bce and is still in use today, particularly in Asia. Now, as then, it typically consists of a rectangular frame with thin parallel rods strung with beads.

Detailed explanation-4: -The predecessor to the modern abacus was the counting board, which featured groves or lines between which pebbles or beads were moved. The abacus, on the other hand, featured rods, and could have been made out of stone, metal, or wood.