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教学内容:西南师大版《义务教育课程标准实验教科书·数学》五年级下册第80～82页。教学目标:1.使学生初步理解用字母表示数的方法,会用含有字母的式子表示简单的数量、数量关系和计算公式。2.使学生经历体验过程,初步感受用字母表示数的作用和优点,进一步体会数学的抽象性与概括性,发展符号感。3.结合现实情境使学生感受用字母表示数的应用价值,并在动手实践、自主探索、合作交流中获得成功的体验。
Teaching content: Southwest Normal University version of “compulsory education curriculum standard experimental textbook mathematics” fifth grade volumes 80 ~ 82 pages. Teaching Objectives: 1. To enable students to initially understand the number of alphanumeric methods, will use the letters containing the formula that the number of simple, quantitative relations and formulas. 2. To enable students to experience the process, the initial impression of the role of the number and the advantages of letters to further understand the mathematical abstraction and generality, the development of a sense of symbol. 3. Combined with the real situation so that students feel the value of using the number of letters, and practical experience, independent exploration, cooperation and exchange to get a successful experience.