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美国著名数学教育家赫斯指出:“问题不在于教学的最好方式是什么,而在于数学到底是什么,如果不正视数学的本质问题,便永远解决不了教学的争议。”可见,好的教学,一定是源于对内容本质的理性把握和深刻分析。“用字母表示数”是苏教版小学数学五年级上册第八单元的内容。这一内容是代数学习的起始阶段和重要环节,理解用字母表示数的意义是运用代数式、方程、正反比例等进行交流的前提条件,是形成符号意识、代
Hess, a famous American mathematical educator, pointed out: “The problem is not what the best way to teach, but what is mathematics, and if we do not face the essence of mathematics, we can never solve the controversial teaching.” Of teaching, must be derived from the rational nature of the content and profound analysis. “The number of letters ” is the content of the eighth unit of the fifth grade of the Supian version of elementary school. This content is the initial stage and an important part of algebraic learning. To understand the meaning of alphanumeric characters is the precondition for the use of algebraic equations,