An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1] An abacus consists of a two-dimensional array of slidable beads (or similar objects). In their ...

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 wires. The user, called an abacist, slides counters by hand on rods or in grooves.

2025年3月2日 · 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 was in universal use in Europe in the Middle Ages, as well as in the Arab world and in Asia.

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2023年7月25日 · What is an abacus? An abacus is a calculating tool that’s been used for centuries and is still popular in many countries. It’s pronunciation is “a-buh-kuhs.”

An abacus has beads that slide on rods. It can be used to count, add, subtract, multiply and more. the column on the far right is for ones (1,2,3,...) the next column is for tens (10,20,30,...) the next column is for 100s (100,200,300,...) etc; Just like our decimal number system!

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