Etichetta: Abacus

Abacus Counting Frame

Abacus Counting Frame

Abacus lets you to learn to count like in the past directly on your smartphones and tablets.The Abacus is a calculating tool, also called a counting frame, that was used in Europe, Cina, Japan and Russia, centuries before the adoption of the written Hindu-Arabic numeral system.Abacus offers you to discover both ...

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