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最近低年级数学教学中会经常碰到这样的两类图:(第一幅图原来有10个圈,先划去4个,然后筐走4个,还剩几个;第二幅图原来有6个心,筐走4个,又拿来3个,现在有多少个)图中是让我们分别列出连减和先减后加的算式,很多孩子都会出错。细想数学教学中最早接触到的解决问题应该是看图列式计算了,这类解决问题训练的不就是孩子对最基本的数量关系(添上求总数、去掉求部分)的理解和运用吗?数学的核心应该是透过数学知识表面而存在的数学思想和方法,而数量关
The recent lower mathematics teaching will often encounter such two types of maps: (the first figure had 10 laps, first to 4, then the basket to go 4, leaving a few; the second picture of the original 6 hearts, 4 baskets, 3 more, and how many are there now.) In the picture, let’s separate the formulas of decreasing and decreasing respectively, and many children will make mistakes. Think carefully mathematics teaching the first exposure to solve the problem should be to figure out the formula calculation, and this problem-solving training is not the child of the most basic quantitative relationship (add the total number, get rid of the part) understanding and use it? The core of mathematics should be mathematic thinking and methods that exist through the surface of mathematical knowledge,