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教学内容:青岛版《义务教育教科书·数学》五四制三年级上册第九单元信息窗“3周长与面积的关系”。教学目标:1.在探究活动中发现当周长一定时,长方形的长和宽越接近,面积越大,正方形的面积最大。2.在主动探索、交流、合作中尝试枚举法、列表法,渗透有序思考及数形结合的思想。3.从数学现象中发现数学规律,体会数学在生活中的应用价值。教学重点:经历探究过程,发现长方形的周长和面积之间的关系。教学难点:让学生学会有序的、全面
Teaching content: Qingdao version of “compulsory education textbooks, mathematics,” May Fourth system of the third grade on the ninth unit information window “3 perimeter and area relationship ”. Teaching Objectives: 1. In the exploration activities found that when the circumference of a certain, the rectangle of the length and width closer, the larger the area, the largest square area. 2 in the initiative to explore, exchange, cooperation try enumeration method, list method, infiltration of orderly thinking and combination of ideas. Find the law of mathematics from mathematical phenomena and realize the value of mathematics in life. Teaching focus: Experience the process of inquiry, found the relationship between the perimeter and area of the rectangle. Difficulties in teaching: Students learn to be orderly and comprehensively