一、新知在活动中生成第一课时长方体和正方体特征认识,以往的教学是先出示教材中给出的实物,学生说一说对长方体的认识,然后拿出课前准备的实物摸一摸,数一数,给出棱、面、顶点的概念,并借助课件动画演示,比一比相对应的面、棱的相等关系,多媒体的应用,使得教学更加直观,也提高了课堂教学效率,但依然抹不去知识被强加的影子。如何做到让学生在操作实践活动中,深度理解的基础上认识特征?再次教学该 First, the new knowledge generated in the activities of the first class of cuboid and cube features, the previous teaching is first presented in the teaching material in kind, the students talk about the understanding of the cuboid, and then come up with the physical preparation of class touch, The concept of edges, faces and vertices is given. With the demonstration of courseware animations, the equal relationship between faces and edges, and the application of multimedia, compared with the corresponding one, make the teaching more intuitive and improve the efficiency of classroom teaching. However, Still can not wipe the shadow of knowledge is imposed. How to make students understand the characteristics on the basis of deep understanding in practice and practice activities?