本单元的内容是百以内加减两步计算,教材中只安排了三个例题,练习册中配三段相应的练习题和两段综合练习题。例题的安排是先讲加减两步笔算的基本方法,再讲三数连加的竖式计算,最后讲其中有一步能口算时,可用口笔算相结合的方法进行计算。 The content of this unit is one hundred plus or minus two-step calculation, the textbook is arranged only three cases, the exercise book with three corresponding exercises and two comprehensive exercises. The example of the arrangement is to talk about the basic method of adding and subtracting two-step pen and talk about the vertical calculation of three-digit plus and finally one of them can be calculated by using the combination of pen and pen calculation.