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Calculation on an abacus was mainly done with the help of what?

Answer and explanation

Correct answer: Beads

Direct answer: Option A, beads, is correct. An abacus is an early calculating device made with rods or wires and movable beads. The user moves beads according to place value, and the positions represent numbers. By grouping or moving beads, a person can perform addition, subtraction and other calculations. The reasoning is therefore based on the abacus’s visible physical parts: rods plus beads, not electronic components. Option A names the part used for counting. Option B is wrong because vacuum tubes belong to early electronic computers, not ordinary abacuses. Option C is wrong because a microprocessor is a modern electronic processing chip and an abacus has no such chip. Option D is wrong because a laser beam is not the counting mechanism of an abacus. A clean memory trick is: “abacus = beads on rods”; it is a manual calculating aid, not an electronic computer.

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AbacusBeadsEarly Calculator

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