FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The correct answer is Abacus. The abacus is one of the counting devices invented in ancient times to help count large numbers, but it is believed that the abacus was first used by the Babylonians as early as 2, 400 B.C.

Detailed explanation-2: -So human civilization invented the abacus, which the Computer History Museum suggests is “the oldest continuously used calculating tool aside from fingers.” Though still in use in today, the abacus was merely the beginning of mankind’s interest in calculating machines, which have evolved radically over the years.

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: -Mesopotamian or Sumerian is one of the oldest human civilizations. The people of Sumerian civilization used the first abacus for counting. The old Babylonian scholars used their sexagesimal system in the abacus for mathematical functions like addition and subtraction.