Abacus Counting Frame3.0

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 and 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). These abacuses are mainly present in Asia (China, Japan, ...)

The Abacus application lets you to write numbers and to discover their representation in decimal system at the bottom of the screen. You can also make operations like addition, subtraction, multiplication and division. Kids will love rediscover this old object on smartphones while the oldest will remember their younger years with happiness.

It is also possible to choose the number of wires that you want to display on the screen. A sharing feature is also available to share numbers created with your friends via the social networks.

A Pro version with No Ads is also available here :
https://play.google.com/store/apps/details?id=com.ssaurel.abacus.pro

Don't hesitate to give it a try to Abacus and give me your feedbacks or ideas for new features via email : sylvain.saurel@gmail.com