苏教版小学数学四年级下册安排了《平移、旋转和轴对称》的教学。在教学“旋转”时,笔者颇感困惑,学生也很感困难。如在教学例3(如图1)时,学生能顺利完成操作活动,在方格纸上画出旋转后的图形,学生也能较为顺利地完成,但在做练习一第4题(如图2)时却感到十分困难。因为,这里的三角形是任意的,只有一条边与格线重合;梯形是直角梯形,旋转点也不是直角顶点,有近一半学生按要求独立完成有困难,需 Sujiao version of elementary school mathematics fourth grade under the arrangement of “translation, rotation and axisymmetric” teaching. In teaching “rotation ”, I am quite confused, students feel very difficult. As in teaching example 3 (Figure 1), students can successfully complete the operation activities, draw the rotated graphics on the squared paper, and the students can finish the work more smoothly. However, in the fourth exercise 2) feel very difficult. Because here the triangle is arbitrary, only one side coincides with the grid line; trapezoid is right trapezoid, the rotation point is not a right angle vertex, nearly half of the students to complete the difficulty of independent requirements required