四年级数学上册第3单元《角的度量》角的画法教案2新人教版.doc

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1画 角使用说明及学法指导:1、自学课本第 43 页,用红笔勾画出疑惑点;独立思考完成自主学习和合作探究任务,并总结规律方法。2、针对自主学习中找出的疑惑点,课上小组讨论交流,答疑解惑。学习目标:1、使学生会用量角器按指定度数画角,并通过练习进一步巩固角的有关知识。2、培养学生动手操作能力及分析、推理的能力。3、培养学生自学能力。学习重点:会用量角器按指定度数画角学习难点:培养学生动手操作能力学习准备:量角器 三角板。教学思路(纠错栏)1、自主学习1、 用量角器量出三角板各角的度数2、画角通常有两种方法:一种是用( )画角;另一种是用( )画角.2、合作探究(一)阅读课本 43 页,画一个 65的角1、试一试,我会画:2、我的方法是:(1)画一条( ) ,使量角器的( )和射线的( )重合,( )和射线重合。(2)在量角器对准( )的刻度点一个点。(3)以画出的射线的端点起,通过刚才的点,再画一条( ) 。(二)画一画:1、完成课本 43 页“做一做”的第 2 题(1)2、画出 60、90、120、135的角三、过关检测:1、完成课本 45 页第 6 题。22、完成课本 46 页第 11 题3、作业完成 46 页 12 题(任选三个,分别为:锐角、直角、钝角)四总结、评价:

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