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(一)启发学生大胆猜想,初步建立空间观念。建立学生的几何空间观念,展开想象是关键。但面对抽象的几何图形,怎样转变成形象的几何图形让初出茅庐、空间观念薄弱的学生心领神会呢?在教学三年级下学期“面积和面积单位”中,我注重为学生创设民主、宽松、和谐的教学环境和学习气氛,让学生积极自主地参与知识的形成过程,让他们动手动脑,独立操作和实践,自主地获取知识,成为学习的主人。课的第一环节,学生认真观察课件出示的情境图提问:“你们知道如果在画的四周围加上边框,是求什么?”让学生自主思考,借助生活中的物体特征能想象出相似的几何图形。当学生给出正确答案“周长”之
(A) inspire students to bold guess, the initial establishment of space concept. Establishing the students’ concept of geometric space and developing the imagination are the key points. But in the face of abstract geometric figures, how to transform the geometrical figure into an image so that the inexperienced and space-minded students take the lead in mind? In the third semester of Teaching, “Area and Area Unit”, I focused on creating a democratic, , Harmonious teaching environment and learning atmosphere, so that students actively and autonomously participate in the formation of knowledge, let them brainstorm, independent operation and practice, to acquire knowledge autonomously, to become the masters of learning. The first part of the class, students carefully observe the situation presented by the courseware Q: “Do you know if you add a border around the painting, is what?” “Let students think on their own, with the help of the characteristics of objects in life can imagine Similar geometry. When the students give the correct answer ”circumference "