华罗庚是我国杰出的效学家。他初中毕业后,因为家贫没有升学,就到上海去读职业中学。在上海期间,有一件让人难以忘怀的事,那就是华罗庚获得了上海市珠算比赛第一名。当时,参加这次比赛的,大多效都是银行的职员和钱庄的伙计,他们每天都和算盘打交道,可以说是打算盘的熟手了,而华罗庚呢?小时候帮助家里料理小店时,虽然也学会了打算盘,但毕竟不能跟这些高手相比。怎么办呢?不能力取,只能智取!于是,华罗庚对传统的打算盘的方法进行了分析:加减法已无法简化,但乘法还可以简化。普通乘法总是“留头法”或“留尾法”(将“乘数”打上算盘,再用 Hua Luogeng is an outstanding Chinese efficiency practitioner. After he graduated from junior high school, he went to Shanghai to study in vocational schools because he was poor and did not go to school. In Shanghai, there is an unforgettable thing, that is, Hua Luogeng won the first place in Shanghai abacus competition. At that time, most of the participants in the competition were bank staff and bank folk who dealt with the abacus every day, so to speak. Learn to plan disk, but after all, can not be compared with these masters. What to do? Not able to take, only wise! So, Hua Lo-geng on the traditional method of analysis of the plate was analyzed: Addition and subtraction has been unable to simplify, but multiplication can be simplified. Ordinary multiplication always “left head ” or “left tail ” (“” multiplier "marked on the abacus, and then