小学数学教材把长方形和正方形的有关知识分散在第四册和第六册里出现。第四册有长方形和正方形的特征、周长的计算;第六册有长方形和正方形的而积计算。纵览教材,可以看到这部分内容概念比较多,需要实际操作的比较多。据初步统计,先后出现的概念约十五个,要求教师或学生动手的近三十处。心理学告诉我们,低中年级儿童的抽象思维还不够发展,正处于形象 Primary school mathematics textbooks and rectangles of the relevant knowledge scattered in Volume IV and VI appeared. The fourth book has the characteristics of rectangular and square, the calculation of the circumference; the sixth book has a rectangular and square and plot calculation. Overview of teaching materials, you can see this part of the concept of more content, need more practical operation. According to preliminary statistics, there are about 15 concepts that have emerged, requiring nearly 30 teachers or students to start hands-on activities. Psychology tells us that the abstract thinking of low and middle school children is not enough development, is in the image