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[教学内容]四年级(上册)第18～20页。[教学目标]1.体会统一角的计量单位和度量工具的必要性,认识角的计量单位,建立1°角的表象;通过量角,建立角的大小的量化观念;结合操作,感受角的大小与所画边的长短无关。
[Teaching content] Fourth grade (the first volume) 18 ~ 20 pages. [Teaching Objectives] 1. To understand the necessity of unit of measurement and measure of unity angle, recognize unit of measure of angle and establish the appearance of angle of 1 °; to establish the quantitative concept of angle by measuring angle; to combine the operation and angle of view The size and the length of the painting has nothing to do.