三年级学生对于平移和旋转现象已经有一定的生活体验,但还没有很清晰的认识。对于平移的方向,学生容易理解;但对图形平移的距离,学生往往会把平移前后图形间的格数误认为平移的距离。根据教学内容和学生的思维特点,我采用了直观情境教学法、演示操作法和自主探究的教学方法,设计了如下教学环节。一、导入新课,进入主题首先,教师引入问题:“同学们都去过游 Third graders already have some experience of living and working in translation and rotation, but they do not yet have a clear understanding. Students can easily understand the direction of translation. However, for the distance of translation, students often mistake the number of translations between the figures before and after translation as the translation distance. According to the teaching content and the thinking characteristics of the students, I adopted the teaching methods of intuitionistic situational teaching, demonstration and self-exploration, and designed the following teaching steps. First, the introduction of new courses into the theme First, the teacher introduced the question: ”Students have to travel