WORLD CIVILIZATION

Detailed explanation-1: -Mesopotamia. The Sumerian abacus appeared between 2700 and 2300 BC. It held a table of successive columns which delimited the successive orders of magnitude of their sexagesimal (base 60) number system.

Detailed explanation-2: -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-3: -What is Abacus? It is an instrument that is used to calculate or count by using sliding counters and a rod. It was indeed the world’s first calculator. It was first used in Europe, China, and Russia.