一、背景与思考本节课(北师大版教材五年级上册)的定位是在探索和验证中,通过综合运用前面学习的对分数理解的不同方面,一方面再次加深对分数意义的理解,另一方面探索分数的基本性质。对于“分数基本性质”教学,可以有不同的引入方法。如,学生已经学习了分数与除法的关系、除法中商不 First, the background and thinking The orientation of this lesson (Beijing Normal University version of the fifth grade textbook) is in the exploration and verification, through the comprehensive use of the previous study of different aspects of understanding of the score, on the one hand deepen the understanding of the meaning of the score, On the other hand explore the basic nature of the score. For the “basic nature of scores” teaching, there are different ways to introduce them. For example, students have learned the relationship between the scores and the division, the division is not business