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== Yupana ==
== Yupana ==
Yupana is an Incan counting device similar to an abacus.
[[File:Yupana-origins.png|300px|From http://en.wikipedia.org/wiki/File:Yupana.jpg]]
Yupana is an Incan counting device similar to an [[Activities/Abacus|abacus]].
[[File:Yupana.png|300px]]
[[File:Yupana.png|300px]]
* '''Did you know''' that you can use the yupana over the network with your friends?
* '''Did you know''' that you can use the yupana over the network with your friends?
==== An alternative interpretation ====
There are some alternative interpretations of how the Yupana works, e.g., [http://www.atlantisbolivia.org/decodingquipumaths.htm]. In this version, the base is 20, and rows with multiple dots are counted as 2s.
Yet another interpretation (by the author) is that the factor of each bead is based on the number of beads in its containing box, e.g., each bead in the top row, x1; in the second row, x2; in the third row, x3; and in the bottom row, x5.
Both of these alternative interpretations are available under the "spanner" toolbar beginning with Version 3.
==== Customize ====
As of Version 4, the learner can explore their own interpretations of how the Yupana works.
[[File:Custom-yupana.png|300px]]
In the above example, the beads are valued as x1, x2, x6, and x24 with a base of 144. This is arguably the most efficient representation.
=== Where to get Yupana ===
=== Where to get Yupana ===
The Yupana activity is available for download from the [http://activities.sugarlabs.org Sugar activity portal]: [http://activities.sugarlabs.org/en-US/sugar/addon/4533 Yupana]
The Yupana activity is available for download from the [http://activities.sugarlabs.org Sugar Activity Library]: [http://activities.sugarlabs.org/en-US/sugar/addon/4533 Yupana]
The source code is available on [http://git.sugarlabs.org/yupana the Sugar Labs Gitorious server].
The source code is available on [http://git.sugarlabs.org/yupana the Sugar Labs Gitorious server].
[[Category:Activity]]
[[Category:Activity]]