File:AbacusBaseFiveTen.PNG
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| Description | This is the small abacus of Al-Khwārizmī abacus with base-five/ten. All upper beans have the five values, and all down beans has the ten values. Hypothetically, this kind of abacus was used on the paleography of modern numerals: five, six, seven (down beans) and eight, nine, ten (upper beans). It is assumed to have originated because humans have ten fingers. |
| Date | born around 780 and died around 850 |
| Source | http://en.wikipedia.org/wiki/Muhammad_ibn_Musa_al-Khwarizmi |
| Author | Al-Khwārizmī |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:41, 11 April 2008 | | 178 × 97 (42 KB) | Robertolyra (talk | contribs) | {{Information |Description=This is the small abacus of Al-Khwārizmī abacus with base-five/ten. All upper beans have the five values, and all down beans has the ten values. Hypothetically, this kind of abacus was us |
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