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【课前思考】“乘法分配律”是苏教版四年级下册第54-55页的教学内容,这是学生在学习了加法、乘法的交换律和结合律的基础上学习的新的运算律。但乘法分配律与以前学习的运算律相比,结构更复杂,意义更隐密,对学生来说很抽象。教材由同一问题的两种解法建立等式,然后引导学生观察比较,发现等号两边的算式数据、符号之间的联系,并仿写几组这样的等式,通过不完全归纳法,最终得出乘法分配律。
[Thinking before class] “law of multiplication and division ” is the content of the teaching content of the fourth grade of the Sujiao version of the fourth grade 54-55 pages, which is the students learning new additions, multiplication law of exchange and law based on the new The law of operation. However, the multiplicative assignment law is more complicated in structure and more implicit in meaning than the law of learning previously learned, and is very abstract to students. Textbook by the same problem two solutions to establish the equation, and then guide the students to observe and compare the arithmetic data found on both sides of the equal sign, the symbolic linkages, and Imitation of several groups of such equations, by incomplete induction, the final The law of multiplication distribution.