A divider is the division of two digits. The first volume of mathematics for the fourth grade in Qingdao edition, with 76 pages, is about dividing divisors into two digits. (The last Qingdao edition) is a book published on 20 1 1 by Liu Qiang. In view of the test sites, key points and difficulties, typical examples are selected, and the coach demonstrates the method, skills and standardization steps of solving problems, revealing the thinking and skills of solving such problems and gaining insight into the law of test proposition.