Russian Grandmas abacus
+ with Instruction!
The abacus is one of the first computing device. They are a frame strung with spokes beads, usually of 10 pieces.
Did you know that the abacus can add and subtract numbers?
In this application, you will find the abacus and instructions for their use. This manual was created from the experience of those who have worked for ten years with the abacus.
Today, we are ready to share this experience with you!
Install the app on your device right now!