History of Hindu Mathematics: A Source Book v1.c8.s4.95

v1.c8.s4.95

“That method of multiplication in which the numbers stand in the same place,¹ is called *tastha-guṇana*. It is as follows: after setting the multiplier under the multiplicand multiply unit by unit and note the result underneath. Then as in *vajrâbhyâsa* multiply unit by ten and ten by unit, add together and set down the result in the line. Next multiply unit by hundred, hundred by unit and ten by ten, add together and set down the result as before; and so on with the rest of the digits. This being done, the line of results is the product.”²