“认识平行四边形的特征”(苏教版四年级下册),根据教材编排,先组织学生自选学具创作平行四边形,在操作活动中感知、体会其特征,再组织学生讨论交流,将“平行四边形对边相等、对边平行”揭示出来。 “Recognition of the characteristics of parallelogram ” (Jiangsu Education Publishing House fourth grader), according to the textbook arrangement, the students were selected to create parallelograms, perception in the operating activities, to understand its characteristics, and then organize student discussion and exchange “Parallelogram equal on both sides, parallel to the side ” revealed.