Mathematics in Ancient and Medieval India c5.s8.2

c5.s8.2

These operations were carried out on a dust computing board (*pāṭī*). The method required the rubbing out of digits in every operation. According to Arabian scholars Āl-Khwārizmī (825 A. D.), Al-Uqlidisi (952 A. D.) Hindu arithmetic entered Islam with dust abacus as an intrinsic tool of it.² The latter author replaced the dust abacus to suit paper and ink. He used the Arabic word *takht* for *pāṭī*.