Ancient world history series in #historicals contains: The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times. It was used in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the Hindu-Arabic numeral system. The exact origin of the abacus has not yet emerged. Chapters: 01:04 - content 01:14 - Invention of the Abacus 02:48 - Sumerians ancient Abacus 04:00 - Abacus in history of Rome, India, China and Greece 04:45 - How Abacus Works
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