Using an abacus to do division is a lot more difficult than to do multiplication , at least according to my own experience , particularly when one number is not divisible by the other 以我的经验来说，用算盘计算除数比起计算乘数难得多，尤其当其中涉及不能整除的数字。
Such fine calibrations may date back to the use of the abacus , and to an old chinese convention that assumes a 360 - day year for the purpose of reckoning interest payments 如此精细的调整可追溯到算盘的使用，追溯到中国的一个古老传统，即假设一年为360天，以达到简化利息支付的目的。
It is not difficult to see that this would make calculating interest more convenient if one was using an abacus instead of a calculator or computer . perhaps this is why the tradition was established 试想像用算盘而不是计数机或电脑的话，可以被9整除的利率会使计算利息更方便，说不定这就是被9整除这个习惯逐渐形成的原因。
The mechanized mathematics has a highly development in ming dynasty , the abacus ' s perfected standardize is one hand , the other hand is fundamental algorithm ' s standardize , a pithy formula , program 二、数学机械化的思想方法到明代得到了高度发展和完善。其一是表现在实现算法的硬件? ?算盘的完善和规范化；其二是实现算法的软件? ?基本算法的规范化、歌诀化、程序化。
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Xinghua artistic training center : taught by professional teachers , they offer such classes as the piano , electrotone , the violin , drawing , calligraphy , pottery , dancing and figure - shaping , latin dance , martial art , speech making , literacy of complicated chinese characters and arithmetic classes using abacus and mental arithmetic 兴华艺术培训中心：由专业教师执教，开设钢琴、电子琴、小提琴、美术、书法、陶艺、舞蹈形体、拉丁舞、武术、小巧嘴、繁体字识字班及珠心算班。
