Roman calculator with marble stones

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Roman calculator with marble stones

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This type of calculator, or abacus, is made after several Roman originals and depictions. The abacus shows the dozens and hundreds and the stones make up the units. This makes it easy to add up and subtract.

Calculators like this were used until the Late Middle Ages at schools and for making daily calculations.

This abacus is completely functional and measures 20 x 15 cm.

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