現行小学算术課本20以內的数的教学,主要要完成如下几方面的任务: 1.教会儿童数20以內的数,确切了解每个数的含意,知道各数在自然数列中的位置和大小; 2.教会儿童写数字; 3.教会儿童計算20以內的数的加法和减法(包括解答簡单应用題)。关于20以內的数的教学內容,我們可以这样来說:它既是构成建筑物的磚头或部件,也是建筑物的地基。我們常常看到,有些小学生到了高年級数字还写得歪歪扭扭,大一 The teaching of the number within the current primary school mathematics textbooks 20 mainly accomplishes the following tasks: 1. The number within the church of 20 children, knowing exactly the meaning of each number and knowing the position and size of each number in the natural number sequence; 2. Church children write numbers; 3. Church children calculate the number of additions and subtractions within 20 (including solving simple application questions). With regard to teaching contents of less than 20, we can say that it is both a brick or a component that constitutes a building and a foundation of a building. We often see that some primary school pupils still crooked at the upper grades and freshmen