History of Hindu Mathematics: A Source Book v1.c8.s10.19

v1.c8.s10.19

In the works of early Arab writers the methods of testing multiplication, and division without remainder, by the check of nines are given, while a complete set of rules for testing all operations is found first in the works of Avicenna² (*c.* 1020) who calls his method the "Hindu" method. Maximus Planudes³ also ascribes an Indian origin to the check of nines.