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). 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.

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

// Option A //

To download Sylvain Saurel mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Sylvain Saurel mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Sylvain Saurel from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Sylvain Saurel in HappyMod App.