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一、借助旧知识,建立新概念 比的意义和性质是建立在除法、分数等知识的基础上的,在教学中遵循由易到难,循序渐进的原则,引导学生充分运用已有的知识进行迁移,能收到较好的效果。 1.从除法入手教学比的意义。 教学前,可先提出一些有关的问题让学生复习和口答,如5是3的几倍?3是5的几分之几?已知路程和时间,怎样求速度?使比的概念从一开始就和这些旧知识联系在一起,为学生理解比的意义作好准备。 教学时,教师应引导学生自学课文,对例题“一
First, with the help of old knowledge, the significance and nature of establishing a new concept ratio is based on the division of knowledge, scores and other knowledge, follow the principle of from easy to difficult, step by step, to guide students to make full use of existing knowledge to migrate , Can receive better results. 1. From the division to start teaching than the significance. Before teaching, we can ask some questions for students to review and answer. How many times is 5? 3 is the fraction of 5? Given the distance and time, how to find the speed? The concept of ratio from the very beginning And these old knowledge linked together to prepare students for understanding the meaning of the ratio. Teaching, teachers should guide students to learn texts, the example of "one