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《两步应用题》的教学是在一步计算应用题的基础上进行的。学好这部分内容,对学生今后学习三、四步应用题起着十分重要的作用。而教学例1又是学生学习两步应用题的第一步。例1的教学重点是掌握两步应用题的结构特征及解答方法,难点是找中间问题。 一、导入新课,运用迁移规律 一步应用题的数量关系学生已经掌握,它是解两步应用题的基础。先将教材的例1改成两个一步计算应用题作为准备题:(1)新华小学前年植树125棵,去年植树146棵,前年和去年共植树多少棵?(2)新华小学前年和去年共植树271棵,今年植树的棵
The teaching of “two-step applied questions” is based on the one-step calculation of application questions. Learn this part of the content of the future students to learn three or four step application plays a very important role. The teaching example 1 is the first step for students to learn two-step application questions. The teaching of Example 1 focuses on mastering the structural features and solutions of the two-step application question. The difficulty is to find the intermediate problem. First, the introduction of new courses, the use of migration rules the number of one-step relationship between the number of students have mastered, it is the basis for solving two-step application questions. First, the textbook Example 1 into two one-step calculation of application questions as a preparatory question: (1) Xinhua primary school 125 trees in the previous year, 146 trees last year, the previous year and last year, a total of how many trees? (2) Xinhua Primary School the previous year and last year 271 trees, trees planted this year