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一、以旧引新,设置悬念 1.准备练习:白蝴蝶有2只,花蝴蝶的只数比白蝴蝶多4只。花蝴蝶有几只?(口答) 2.出示例题:白蝴蝶有2只,花蝴蝶的只数是白蝴蝶的3倍。花蝴蝶有几只? 师:这道题就是我们今天要学的一种新的应用题。同上面一道题有什么区别?有哪一个字不理解? 学生通过讨论比较,知道准备题和例题的比较方法不一样。准备题是“花蝴蝶比白蝴蝶多4只”,例题是“花蝴蝶的只数是白蝴蝶的3倍”。教师着重指出:要学会这种应用题,必须
First, the old introduction of new, set the suspense 1 ready to practice: white butterfly has 2, the number of butterflies more than four white butterfly. How many flower butterflies? (Mouth answer) 2.Examples: white butterfly has 2, the number of butterflies is white butterfly 3 times. How many butterfly do you have? Teacher: This is a new question we should learn today. What is the difference with the above question? What word does not understand? Students through the discussion and comparison, to know the preparatory questions and examples of the comparison method is not the same. Preparation questions are “butterfly 4 more than white butterfly,” the example is “the number of butterfly is white butterfly 3 times.” The teacher emphatically pointed out: To learn this kind of application problem, we must