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教材分析:除数是小数的除法是在学生掌握了除数是整数的小数除法的基础上进行教学的。除数是小数的除法只需把除数转化为整数,即:根据商不变的性质把除数和被除数的小数点同时向右移动相同的位数。由于学生对于移动小数点的方法(第八册已学过)掌握得比较熟练,因而,这节课的知识可以说是旧知识的综合运用。本节教学中只要教师搭桥铺路、设计恰到好处的提问,引导学生运用旧知识解决新问题,再安排一些突出重点的练习,就能达到“一顶三”(即一节课顶三节课)的教学效果。
Textbook Analysis: Division of divisors is a decimal division is based on the students mastered the divisor is an integer fractional division based on teaching. Dividing a divisor by a decimal number simply transforms the divisor into an integer, that is: shifting the divisor and the divisor's decimal point to the right by the same number of digits at the same time, according to the invariant property of the quotient. Since students have mastered the method of moving the decimal point (the eighth book has been learned), therefore, the knowledge of this lesson can be said that the comprehensive use of old knowledge. This section of teaching as long as teachers take the bridge paving the way to design just the right questions, guide students to use the old knowledge to solve new problems, and then arrange some focused exercises, you can achieve “one top three” effect.