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怎样才能使学生比较顺利地理解分数乘法法则的推导过程呢?国外的程序教学法和国内编写的数学自学教材的经验给了我们一个有益的启示:根据学生已有的知识基础,精心设计一系列由浅入深的过渡题(可以是应用题,也可以是操作题),把法则推导过程中的难点和理解算法的关键,分散在过渡题中预作铺垫,为新课教学扫清障碍,实践表明,教学效果较为理想。一、寓算理于习题分数乘法的计算法则是由分数乘法的意义所决定的。当乘数是整数时,也即是求几个相同加数的和的简便运算,学生对其意义和计算方法都不难理解;当乘数是分数时,则表示求一个数的几分之几是多少,
How to make students more smoothly understand the derivation of the law of fractional multiplication? Foreign program teaching method and the domestic experience of self-teaching math prepared by the textbook gives us a useful inspiration: According to the students already know the basis of a series of well-designed The transition from shallow to deep (which can be applied to the problem, it can be the operation of the title), the law of the difficulties in the process of derivation and understanding of the key algorithm, scattered in the transitional prelude to pave the way for the new course teaching to clear the obstacles to practice Show that the teaching effect is more ideal. First, the calculation theory in the exercise of fractional multiplication of the law is calculated by the fractional multiplication of the significance of the decision. When the multiplier is an integer, which is the simple operation of seeking the sum of a few same addenda, students can understand the meaning and calculation method easily. When the multiplier is a fraction, it means to find a fraction of a number How much is a few