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一、教学目标(一)认识1.认识多位数加、减法与万以内数的加减法的计算方法相同。2.认识加、减法的一些速算法。3.记住加、减法的验算方法。(二)理解1.懂得用竖式计算多位数的加法时,先把每一位上可以凑成整十的数结合起来再加。2.在减法计算中,能判断用哪种方法计算比较简便。(三)掌握1.正确掌握多位数加减法的计算方法和验算方法。2.能速算接近整十、整百、整千……的数的加减,会根据减法运算性质进行速算。
First, the teaching objectives (A) to understand 1. Recognition of multi-digit addition, subtraction and within the million addition and subtraction method of calculating the same. 2. Know plus, subtraction of some speed algorithm. 3. Remember Canada, subtraction method of checking. (B) to understand 1 know how to use the vertical calculation of multi-digit addition, first of all can make up the whole number of ten together. 2. In subtraction calculation, can determine which method to calculate relatively simple. (C) control 1. Correct grasp of multi-digit addition and subtraction of the calculation method and checking method. 2. Can speed calculation Close to the whole ten, the whole hundred, a thousand ... ... the number of additions and subtractions, will be based on the nature of subtraction computing speed.