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Tag: schoty

Abacus

Posted on May 26, 2025September 21, 2025 By Bob No Comments on Abacus

An Abacus consists of beads or stones on rods or wires each representing a numerical value. Beads are manipulated to perform addition, subtraction, multiplication and division. The one shown here has nine beads on each rod. A horizontal beam divides the rods into an upper and a lower section such that one bead on each rod is…

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