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Summary
| 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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:43, 11 April 2008 | | 529 × 290 (329 KB) | Robertolyra | {{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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