五年制第七册《小数乘法》一节中,讲完小数乘以整数后,紧接着讲一个数乘以小数。一个数乘以小数的计算方法,通过知识迁移,学生不难掌握;而对乘法意义的扩展一即一个数乘以一个纯小数,表示求这个数的十分之几、百分之几是多少,学生理解有一定困难。教学时可通过直观图示,联系实际,使学生 In the five-year volume VII Book “Multiplication of Fraction”, after completing the decimal multiplication by the whole number, we immediately say a number multiplied by the decimal. A number multiplied by the decimal calculation method, through the knowledge transfer, the student is not difficult to grasp; and expansion of the meaning of multiplication that is a number multiplied by a pure decimal, indicating that the number of tenths of this number, what is the percentage, Students understand that there are certain difficulties. Teaching through intuitive pictorial, practical contact, so that students