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分数乘除应用题的解题关键,在于正确判断题中何种数量是单位“1”.而正确判断单位“1”的前提,在于学生充分理解分数与分数运算的意义.因此,分数乘除应用题的教学,除讲解时要紧扣这些意义外,还应设置一些紧扣意义的练习题,供课堂上作分散难点的基本训练或课后练习之用.现将我在教学中所设计的几种练习形式介绍如下:1.根据关键词句的意义寻找标准量(单位“1”)的练习
The key to solve the problem of multiplication and division of scores lies in what kind of quantity is the correct unit of judgment 1. The premise of correctly judging unit is that students fully understand the meaning of fractional and fractional operations.Therefore, Of teaching, in addition to explaining these closely linked to these meanings, but also set some exercises closely linked to the meaning of the class for the scattered or difficult to do the basic training or after-class exercises. Now I designed in teaching a few The practice of the form described as follows: 1 according to the meaning of key words to find the standard amount (unit “1”) practice