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教材分析:本单元是五位数以内的二至三步的四则应用题,教材的安排分三部分:一、一般应用题。例1及其练习,是求两商之差的三步复合应用题;例2及其练习是以包含除或等分除法为基本内容的三步复合应用题;例3及其练习,是求比较两积或两商的倍数关系的三步复合应用题。通过教学,使儿童理解和熟练地掌握这类应用题的解答。二、行程问题。例4、5、6和练习中的1——5题是求时间、距离和速度的应用题。这种应用题儿童在以前分别学过,这里集中复习,在于帮助儿童系统地理解它们之间的相依关系,为学习典型行程应用题打下基础。练习中第4题,是把“距离÷时间=速度”和“速度×时间=距离”结合起来,成为归一算
Teaching material analysis: The unit is five-digit two to three four application questions, teaching materials are arranged in three parts: First, the general application of the problem. Example 1 and its exercises, is to find the difference between the two business three-way composite application problem; Example 2 and its practice is to include the division or the division of law as the basic content of the three-step composite application; Example 3 and its practice, is seeking Compare the two-fold or two-way multiple relationship between the three-step composite application questions. Through teaching, make children understand and master the solution of such application questions. Second, the trip problem. Examples 1, 5, 6 and Exercise 1 - 5 are examples of how to find time, distance, and speed. Children of this type of application, who have previously studied each separately, focus on reviewing to help children systematically understand the interdependence between them and lay the groundwork for learning about typical travel questions. Exercise 4, is the “distance ÷ time = speed” and “speed × time = distance” together to become a normalized count