本单元教材是小学生对数的概念由整数集扩展到分数集的必要准备,起着承上启下的作用。其特点是内容比较抽象,概念多,而且概念与概念之间既有联系又有区别。一方面前面概念是后面概念的基础,后面概念是前面概念的延伸与发展。另一方面很多概念在内涵与外延上很难分辨清楚,容易混淆。因此本单元的复习应注意以下几点。一、突出概念本质属性,注意相似概念辨析本单元很多概念如:自然数与整数、整除与除尽、质数与合数、最大公约数和最小公倍数的求法等等,有的本质属性迥异,有的外延范围不同,学生极易混淆。复习时要通过对比,深化学生对每个概念本质属性的认识,必要时还要找出概念之间的相同点和 The unit textbook is a pupil of the concept of logarithmic expansion from the integer set to the necessary set of scores, plays the role of link. Its characteristics are more abstract content, many concepts, but also between the concept and the concept of both the connection and the difference. On the one hand, the front concept is the basis of the latter concept, which is the extension and development of the preceding concepts. On the other hand, many concepts in the connotation and extension of the hard-to-distinguish, easy to confuse. Therefore, the review of this unit should pay attention to the following points. First, highlighting the essential nature of the concept, pay attention to similar concepts Discrimination of many concepts of the unit such as: natural and integer, divisible and divisible, prime and composite, the greatest common divisor and the least common multiple of law, etc., some of the essential attributes are different, and some Different extents, students easily confused. Review through the comparison, to deepen the student's understanding of the nature of each concept of the concept, if necessary, but also find the same point between the concepts and