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笔者曾听过一节“比一个数多(少)几的数”的应用题教学,教者善于设疑置问,进行变式练习,使学生从本质上把握这类问题的数量关系,其中过程简介如下: 1.出示问题:“饲养小组养了8只黑兔,养的白兔比黑兔少3只,问养了几只白兔?”教师通过画图帮助学生理解题意,引导学生分析数量关系:所求的白兔的只数是从黑兔只数中去掉3只后剩下的相等部分,因此用减法计算。
I have heard a section entitled “Number of Less Than One Number (Less) Several” teaching of applied problems. Teachers are good at setting questions and asking questions and practicing variant exercises so that students can grasp the quantitative relationship of such problems in essence The process is as follows: 1. To produce the question: “raising group of eight black rabbits, raising white rabbits than black rabbits less than 3, raised a few white rabbits?” Teachers help students understand the problem by drawing to guide students Analysis of the number of relations: the number of white rabbits is obtained from the black rabbit only removed the number of 3 after the remaining equal parts, so subtraction.