Abacus - Wikipedia
Abacus-based mental calculation (AMC), which was derived from the abacus, is the act of performing calculations, including addition, subtraction, multiplication, and division, in the mind …
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Abacus - New World Encyclopedia
An abacus (plurals abacuses or abaci), also called a counting frame, is a calculating tool for performing arithmetical processes, often constructed as a wooden frame with beads sliding on …
Abacus | Definition, History, Origin, & Facts | Britannica
6 days ago · Abacus, calculating device, probably of Babylonian origin, that was long important in commerce. It is the ancestor of the modern calculating machine and computer. The abacus …
How to Use an Abacus (with Pictures) - wikiHow
Aug 6, 2025 · The abacus (the suanpan is the most useful variety) is a deceptively simple calculating tool still used all over the world. It's a useful learning device for the visually …