Yupana is an Incan counting device similar to an abacus.
- The beads are organized in columns, where the units (1s) column is farthest to the right; tens (10s) is second from the right; hundreds (100s) is third from the right, etc.
- Click on a dot and it will reverse its state (color), and either add or subtract value from that column.
Yupana is not a part of Sugar desktop, but is often added. Please refer to:
More details regarding the history and use of the Yupana can be found here.
The Yupana activity is available for download from the Sugar Activity Library: Yupana.
Bugs can be reported in the issues tab of this repository.
Please contribute to the project with your ideas and your code.