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【教学内容】北师大版三年级上册第五单元第一课时第44~45页。【教材分析】小学数学三年级对周长的初步认识,是第一学段中“空间与图形”的重要内容之一,也是学生第一次建构周长这个数学概念。因此,让学生结合生活实际和生活经验,形成初步的周长概念对以后的学习有着重要意义。本课教学内容也是第二学段“空间与图形”中关于平面图形面积计算的基础。
【Teaching Content】 Beijing Normal University version of the third grade on the fifth unit of the first lesson when the first 44 ~ 45 pages. Textbook analysis Primary third grade mathematics on the perimeter of the initial understanding is the first section of “space and graphics” one of the important content, but also the first time the students construct the mathematical concept of circumference. Therefore, it is of great significance for students to form a preliminary concept of perimeter for future study by combining the students' life experience and life experience. The content of this course is also the second section of the “space and graphics” on the calculation of the basis of the area of graphic graphics.