An abacus is a calculation 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 the People's Republic of China, Japan, Africa, and elsewhere.

Around the world, abaci have been used in pre-schools and elementary schools as an aid in teaching the numeral system and arithmetic. Abaci are still commonly used by individuals who are blind. They use an abacus to perform the mathematical functions multiplication, division, addition, subtraction, square root and cubic root.

Synonyms: abacus, calculator, computer, electronic calculator, pocket calculator, totaliser, totalizer

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