abacus
An abacus plurals abacuses or abaci is a calculating tool often constructed as a wooden frame with beads sliding on wires It was in use centuries before the adoption of the written Hindu Arabic numeral system and is still widely used by merchants and clerks in China Japan Africa and elsewhere from Wikipedia
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Keywords: abaci, abacus, addition, beads, brass, calculate, calculator, concept, count, device, early, mathematics, subtraction, tool
