“相差关系”应用题教学是低年级应用题的重点和难点。此类题由“求两数相差多少”、“求比一个数多(少)几的数”两大类构成,其特点是两个同类量进行差比,在教学中,学生容易在认识上出现以下问题。 “Discrepancy” application problem teaching is the focus and difficulty of the low grade application questions. Such questions by the “difference between the number of seeking two”, “a number of more than a few (less) several” constitute two categories, which is characterized by two similar amount of difference, in teaching, students tend to be aware of The following problems occur.