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低年级数学以感性学习为主,然而数学最终的目的是理性的思考,中年级学生则处于承上启下的重要阶段,进入四年级下学期,大多数学生已经具备了一定的数学思维水平,类推、归纳等方面的能力都有了长足的进步,所以教师的引导也要有别于低年级的感性教学,逐渐向高年级的理性教学转变,以下简要介绍笔者在教学到《运算律》这一单元时的一些做法和体会:<片段一>加法交换律与结合律的新授(教学时为下一课预设铺垫)
The lower mathematics is mainly sensual learning. However, the ultimate goal of mathematics is to think rationally. Middle school students are at an important stage of inheritance. When entering the fourth grade, most students already have a certain level of mathematical thinking, and so on. And other aspects of the ability have made great strides, so the teacher’s guidance should be different from the lower grades of perceptual teaching, gradual change to the higher grades of rational teaching, the following brief introduction of the author in the teaching of the “law of operation” when the unit Some of the practices and experience: addition of exchange law and the new law of combination (teaching for the next lesson pre-pave the way)