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对应关系是应用题数量关系的一个重要方法,聋校数学13册,分数乘除法应用题中,数量关系的对应关系尤为突出,一直困扰着师生。那么,如何教会对应关系,解分数乘除法应用题呢?一、分数乘除法应用题难点形成的原因:1、没有同整数乘除法进行沟通。2、没有讲清楚分数的概念;3已知一个数的几分之几是多少,求这个数。二、教会抓整体“1”的方法:1、在整体“1”与部分量的比较中,作为整体“1”的量,就是标准量。2、在两个量的比较中哪个量是被比的数量,就是标准量。
Corresponding relationship is an important method of the relationship between the number of applications, deaf school math 13, the multiplication and division of scores applied problems, the relationship between the number of relations is particularly prominent, has been plagued teachers and students. So, how to teach the corresponding relationship, solution score multiplication and division application problem? First, the fraction multiplication and division of application problems difficult to form the reasons: 1, there is no communication with integer multiplication and division. 2, did not make it clear that the concept of scores; 3 known a few what is the number of how many, find the number. Second, the church grasping the overall “1 ” method: 1, in the overall “1 ” and part of the amount of comparison, as a whole “1 ” is the standard amount. 2, in the comparison of the two quantities which is the ratio of the number, is the standard amount.