教学目标:1.通过观察、操作,学生初步认识长方体、正方体、圆柱和球。2.通过摸、滚、推、数等方式,直观感受各种立体图形的特征。3.培养学生动手操作能力,感受数学与生活的联系,初步建立空间观念。教学重点:学生直观认识长方体、正方体、圆柱和球这几种形状的物体和图形。教学难点:初步建立空间观念,使学生感受数学与现实生活 Teaching Objectives: 1. Through observation, operation, students initially understand the cuboid, cube, cylinder and ball. 2. By touching, rolling, pushing, counting, etc., intuitively feel the characteristics of a variety of three-dimensional graphics. 3 training students ability to operate, feel the connection between mathematics and life, the initial establishment of space concept. Teaching focus: Students intuitive understanding of cuboids, cubes, cylinders and balls of these shapes and shapes of objects. Teaching Difficulties: The initial establishment of space concept, so that students feel the mathematics and real life