“万以内的加减法(二)”是在学生学习了万以内数的不连续进位和不连续退位三位数加减法计算方法的基础上进行教学的,是整数加减法的最后部分。学好这部分内容,对于进一步理解加减法的意义,巩固加减法的计算方法、提高计算能力和迁移能力都具有重要作用。本单元学习的“求比一个数多(少)几的数是多少”和“一个条件连续用两次的两步解决问题”为学生 Addition and Subtraction within a million (two) is a teaching method based on the calculation of the three-digit addition and subtraction methods of discontinuous carry and discontinuity of within ten thousand students, which is an integral addition and subtraction The last part. Learning this part of the content, for the further understanding of the significance of addition and subtraction, consolidation and subtraction method to calculate, improve computing power and ability to migrate has an important role. The unit to learn “a number of more than a few (less) the number of what is the number ” and “a condition to solve the problem with two consecutive two steps ” for students