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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, China, Japan and Russia, centuries before the adoption of the written Hindu-Arabic numeral system.Abacus offers you to discover both categories of abacuses :- those in base 10 well known in Europe an Russia in which each wire has 10 beads. Each bead represents, according the wire where it is, a unit, a hundred, a thousand, …- those in mixed base (5,2) or (4,1) for whose each wire has 2 parts : a left part where beads value 5 units (or 5 hundreds, 5 thousands, … according their position on the wire) and a right part where beads value 1 unit (or 1 hundred, 1 thousand, … according their position on the wire).