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在分数四则运算教学中,“一个数乘以分数”的教学,是十分重要的。为搞好这一内容的教学,我们首先应从以下两个方面着手,使学生理解一个数乘以分数的意义。一方面,我们应复习好旧知识,引起学生质疑的兴趣。办法如: (1)出示下图,说明图中苹果一样大后,要求学生口答:1个苹果是9个苹果的几分之几?两个苹果是全部苹果的几分之几?4个苹果是这些苹果的几分之几?
In fractional four arithmetic teaching, the teaching of “a number multiplied by a fraction” is very important. To improve the teaching of this content, we should begin with the following two aspects to enable students to understand the significance of multiplying a number by a fraction. On the one hand, we should review old knowledge and arouse students' interest in questioning. Methods such as: (1) Show the following figure, indicating the apple as big as the picture, ask the students to answer: an apple is a few of the nine apples? Two apples are all the apple a few? 4 apples What is the fraction of these apples?