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教学内容:青岛版《义务教育教科书·数学》四年级下册第40页。教学目标:1.通过测量、类比、推理等数学方法探究多边形的内角和,感受数学思考过程的条理性,发展推理能力和语言表达能力。2.在理解三角形的内角和是180°的基础上,通过把多边形转化成三角形,体会转化思想在解决问题中的作用。3.经历自主提问、独立探究、合作交流的过程,发现变与不变的规律,渗透“普遍性”和“一般化”以及数形结合的数学思想方法,增强解决问题的能力。
Teaching content: Qingdao version of “compulsory education textbook mathematics” fourth grade volume of the first 40 pages. Teaching Objectives: 1. Through the measurement, analogy, reasoning and other mathematical methods to explore the polygons and angle, feel the process of mathematical thinking process, the development of reasoning ability and language skills. 2. On the basis of understanding that the interior angle of the triangle is 180 °, we can understand the role of transformational thinking in solving the problem by transforming the polygon into a triangle. 3.Experienced the process of independent questioning, independent inquiry, cooperation and exchange, found that the law of change and invariance, infiltration “universality ” and “generalization ” and mathematical combination of mathematical and ideological methods to enhance the ability to solve problems .