《数学课程标准》指出:“有效的数学学习活动不能单纯地依赖模仿与记忆,动手实践、自主探索与合作交流是学生学习数学的重要方式.”笔者在教学北师大版七年级数学上册第25页的一道例题时,作了大胆的尝试,收到了良好的效果.一、从实物操作过渡到空间想象例题图1是由几个小立方块 The Mathematics Curriculum Standards states: “Effective mathematics learning activities cannot simply rely on imitation and memory. Hands-on practice, independent exploration and cooperation and communication are important ways for students to learn mathematics.” The author is teaching the seventh grade mathematics of Beijing Normal University. On 25 pages of an example, I made a bold attempt and received good results. I. Transition from physical operations to spatial imaging examples Figure 1 is composed of several small cubes.