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部编第八册教材应用题中的相遇问题,是教学中的难点。这是因为:1.学生对一些术语比较生疏。2.学生对“速度和”的概念较难理解。3.此类题的发展变化形式较多。本节教材的教学重点应放在例1和例2上。通过例1的教学弄清一些术语的实际含义,建立“速度和”的概念。接着运用“速度和”的概念突破例2的教学难点,并进行适当的引伸、变化,这样例4的教学就迎刃而解了。例1的教学可以这样安排: 1.复习速度、路程和时间三量之间的关系。(口答) (1)张华每分钟走65米。从家到学校走了4分钟,从家到学校有多少米?
Part VIII of the textbook application problems in the encounter, is the teaching of the difficulties. This is because: 1. Students unfamiliar to some terms. 2. Students are more difficult to understand the concept of “speed and”. 3. The development of such questions more forms of change. The teaching materials in this section should focus on cases 1 and 2. Through the teaching of Example 1, we can understand the actual meaning of some terms and establish the concept of “speed and”. Then use the concept of “speed and” to break the difficult teaching of Example 2, and make appropriate extensions and changes so that the teaching of Example 4 can be easily solved. Example 1 teaching can be arranged as follows: 1. Review the relationship between speed, distance and time. (Answer) (1) Zhang Hua walk 65 meters per minute. 4 minutes from home to school, how many meters from home to school?