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小学生在遇到“求一个数的几分之几是多少”与“已知一个数的几分之几是多少,求这个数”两类应用题时,难于判断该选用乘法解答还是用除法解答;在解答“求一个数是另一个数的几分之几”时,分不清用谁作为除数,或者在得数后面注上与除数、被除数相同的计量单位名称。学生难于掌握上述三种应用题的正确解法,原因是多方面的。我们根据小学数学教材的编排体系和学生的实际情况,把这三种问题归并为倍数问题,把倍数概念由整数扩充到分数,收到较好的教学效果。
Primary school students in the face of “seeking a few minutes of what is the number” and “a few minutes of a known number of how much is this number,” the two types of questions, it is difficult to determine whether the choice of multiplication or division answer ; In the answer to “find a number is a few of another number,” can not tell who to use as the divisor, or after the number of the note with the divisor, divisor, the same name of the unit of measurement. Students difficult to grasp the correct solution to the above three applications, for many reasons. According to the arrangement of primary school mathematics teaching materials and the actual situation of students, we combine these three problems into a multiple problem, expanding the multiple concept from integer to fraction and receiving better teaching results.