比较的核心就是“比”，把要比的事物放在一起，通过观察、计算、操作实验等手段，概括出它们各自的特征，区别其异同，使事物概念的内涵越发清晰。这里以“长方体和正方体”为例，谈谈如何运用比较方法进行教学。一、实物比较，初步感知通过回忆学过的图形，使学生再现长方形、正 The core of the comparison is “ratio ”, put the ratio of things together, through observation, calculation, operational experiments and other means, summed up their respective characteristics, the difference between similarities and differences, so that the connotation of the concept of things more clearly. Here to “rectangular and cuboid” as an example, talk about how to use comparative methods for teaching. First, the physical comparison, the initial perception through the memories of the graphics learned, so that students reproduce the rectangle, is