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乘法分配律是学生学过加法、乘法交换律和结合律之后学习的又一重要运算定律,是学生学习中的一个难点。教材中只出现字母表达式,淡化了文字描述,这样势必造成学生对运算定律的理解不扎实、概念化水平不深入、过多依赖形式化思考的现象产生。那究竟如何帮助学生建立起乘法分配律的基本结构模型,真正从乘法的意义理解分配律的结构,初步体会数学模型思想呢?一、选取典型问题,构造基本模型模型思想的建立是学生体会和理解数学与外部世界联系的基本途径。所以,在教学
Multiplication assignment law is another important operation law that students learn after addition, multiplicative exchange law and combination law, which is a difficult point in student learning. Textbook appears only in the alphabet expression, desalination of the text description, it is bound to cause students to understand the law of arithmetic is not solid, the level of conceptualization is not in-depth, too much reliance on formal thinking phenomenon. How to help students to establish the basic structure model of the law of multiplication distribution, the real understanding of the structure of the distribution law from the meaning of multiplication, the initial realization of the mathematical model idea? First, select the typical problems, the construction of the basic model of model thinking is the students experience and The basic way to understand the connection between mathematics and the outside world. So, teaching