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人教版九义教材《数学》第十册第三单元“约数和倍数”,在整数的四则运算的基础上,专门教学整数范围内的有关数论的初步知识。这个单元涉及整数范围内的概念繁多,内容抽象复杂。尤其是关于各种“数”的概念,繁多而抽象,相关又相别,教学中学生很容易混淆不清,是教学中的一大难点。而这些知识又是以后学习约分、通分、分数四则运算所必备的基础,所以,这又是教学的一大重点。
PEP textbook “Mathematics” tenth volumes of the third unit “divisor and multiple”, based on the integer arithmetic operation, based on the specific teaching integers integer number range of preliminary knowledge. This unit involves a wide range of concepts in the range of integers, with abstract and complex content. In particular, the concept of a variety of “numbers” is numerous and abstracted, but also related and inaccurate. Teaching students are easily confused, which is a major difficulty in teaching. And these knowledge is the basis of learning about points, pass points, scores of four arithmetic necessary, so this is a major focus of teaching.