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分数工程问题是个重要而又难教的内容.我县小学数学教研学会熊国智老师的教法,颇具改革精神,收到了较好的效果.他的主要教学步骤是:一、抓住关键,作好铺垫让学生进一步理解分数意义、包含除的意义及整数工程问题的数量关系,是学好分数工程问题的关键,教师在新授前,安排了下面的复习题作为铺垫.1.什么叫分数??表示什么意义(用线段图表示)?(复习分数意义,为把“工作总量”看作整体“?”作铺垫.)2.8里面有几个2?1里面有几个???里面有几个??(复习包含除意义,为用“工作总量”除以“工作效率”求“工作时间”作铺垫.)
Fractional engineering problems is an important and difficult to teach content .Xi primary school mathematics teaching and research Association Xiong Guozhi teacher's teaching method, quite spirit of reform, received good results .His main teaching steps are: First, to seize the key to do a good job Paving the way for students to further understand the meaning of scores, including the meaning of division and the number of integer engineering problems, is the key to learning how to score engineering problems, teachers in the pre-grant, arranged the following review questions as a bedding .1. What does it mean (using line segments)? (Review the meanings of fractions and pave the way for “Total Work” as a whole.) There are several 2? There are several in the review (including the meaning of the review, the use of “total work ” divided by “work efficiency ” “working time ” to pave the way for.