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− | [[File:Abacus.jpg]]
| + | == Abacus == |
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− | == About Abacus ==
| + | Read at https://help.sugarlabs.org/abacus.html |
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− | [[File:Abacus-icon.png]] | + | The source file has been moved to [https://github.com/godiard/help-activity/blob/master/source/abacus.rst GitHub] |
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− | [http://activities.sugarlabs.org/en-US/sugar/addon/4293/ download v1]
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− | [http://en.wikipedia.org/wiki/Abacus Abacus] lets the learner explore different representations of numbers using different mechanical counting systems developed by the ancient Romans and Chinese. There are several different variants available for exploration: a [http://en.wikipedia.org/wiki/Suanpan suanpan], the traditional Chinese abacus with 2 beads on top and 5 beads below; a [http://en.wikipedia.org/wiki/Soroban soroban], the traditional Japanese abacus with 1 bead on top and 4 beads below; and the [http://en.wikipedia.org/wiki/Abacus#Russian_abacus schety], the traditional Russian abacus, with 10 beads per column, with the exception of one column with just 4 beads used for counting in fourths.
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− | <gallery>
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− | File:Suanpan.png|suanpan
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− | File:Soroban.png|soropan
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− | File:Schety.png|schety
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− | </gallery>
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− | === Coming soon ===
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− | Nepohualtzintzin, a Mayan abacus based on 20.
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