AbacusBeansFiveTen.PNG (529 × 290 pixels, file size: 329 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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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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