加减计算中巧用“弃九法”的研究

Using addition and subtraction in the calculation of "disposable nine method"

"并行弃九加法"是一种实用、快捷的珠算加法,本研究引入了补数概念,变减法为加法,再用"并行弃九加法"实施计算,旨在拓宽这一算法的应用范围。

＂Nine disposable parallel addition＂ is a practical,efficient abacus addition,this paper introduces the concept of complement,change subtraction to addition,and then ＂jumped nine parallel addition,＂ implementation of the calculation,designed to broaden the scope of application of the algorithm.