数。在运算过程中，往往被除数郊区每次商与除数的乘积都有剩余的数，通常也叫做余数。
退商：初商过大，把它改小叫“退商”。
补商：初商过小，把它改大叫“补商”。
假商：在除法运算中，为了计算便捷，先确立一个商，再经过调整取得确商。先确立的商，叫做假商。
清盘：拨去各档靠梁的算珠，使全盘成为空盘，叫做清盘。
全盘练习：算盘所有档上，或大部分档上作拨珠练习，以及按基本运算法则进行全面练习，叫做全盘练习。
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