解题时,不少学生常出现见“多”就加,见“少”就减的错误。其原因不外乎教学方法不当,教材安排欠妥,使学生理解欠佳。预防此类问题的发生,教学时应采取以下措施。一、以旧促新,打好基础学生掌握“同样多”与“甲比乙多”、“乙比甲少”等概念,是教学“求比一个数多(少)几的数”的基础。要通过复习使学生能比较两个具体量的大小,明确谁与谁比,以谁为标准,得知甲比乙多就是乙 Problem-solving, many students often see “more ” plus, see “less ” to reduce the error. The reason is nothing more than improper teaching methods, improper teaching materials, poor understanding of students. Prevention of such problems, teaching should take the following measures. First, the old promotion of new, lay the foundation for students to master “the same ” and “A than B more ”, “B less than ” and other concepts, is teaching ) A few of the number of "basis. To pass the review so that students can compare the size of two specific amount, who is clear with whom, to whom the standard, that is more than a B