1教学背景“长方体的认识”是人教版小学数学第十册第27-29页的教学内容。学生在一年级初步认识了一些简单的立体图形,已经能够识别长方体、正方体、圆柱和球等图形,在前几册教材中还学习了一些平面图形的有关知识,形成了一定的空间观念。本课题内容就是在此基础上开始学习立体图形的知识,而由研究 1 Teaching Background “Cuboid understanding ” is the teaching content of the PEP Tenth Edition of Mathematics on the first page 27-29. Students in the first grade preliminary understanding of a number of simple three-dimensional graphics, has been able to identify cuboids, cubes, cylinders and balls and other graphics, in the first few textbooks also learned some knowledge of plane graphics, forming a certain space concept. The content of this subject is based on this study began to learn the knowledge of three-dimensional graphics, but by the study