青岛版小学数学四年级上册《认识垂直及垂线的画法》教学设计.doc

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1、青岛版小学数学四年级上册认识垂直及垂线的画法教学设计垂线的画法教案认识垂直及垂线的画法教学设计教学内容：青岛版小学数学四年级上册认识垂直及垂线的画法教学目标：1.通过情景知道两条直线相交成直角时，两条直线互相垂直。其中一条直线叫做另一条直线的垂线。能选择合适的工具画出已知直线的垂线。2.通过学生动手操作，培养学生的作图能力。3.注重培养学生的探究思维，激发学习兴趣。教学重点：认识垂直，掌握垂线的画法，能灵活画图。教学难点：掌握垂线的画法。教学准备：教具：课件，微课视频，教学用三角尺。学具：学生用三角尺一套，直尺、量角器、方格纸等。教学过程：一、 创设情景，导入新知。 教师情景图：师：从图中你能

2、发现哪些数学信息？你又能提出什么问题？学生自由交流。（教师引导学生认识：两条直线是相交的，而且是成直角的）二、 合作探索（一）认识垂直课件出示：1. 师：这几组直线有什么特点？让学生观察并用三角板验证，得出这几组直线相交都成直角。2.师：像上面这样：两条直线相交成直角时，这两条直线互相垂直，其中一条直线叫做另一条直线的垂线，它们的交点叫做垂足。出示：3. 你能举例说一说生活中的垂直现象吗？（二）学画垂线1.师：你能画出两条互相垂直的线吗？请同学们独立思考可以选择什么工具，试着画一画。2.学生汇报，自己选用了什么工具，又是怎么操作的。预设学生可能用的方法有一下几种：3.师：同学们非常善于动脑，想

3、出了这么多的办法，在这些方法中，你觉得用那种工具操作最简单、最方便呢？引导学生比较认识到三角板是比较好的画垂线的工具。师：那这里我们重点学习用三角板作为工具画垂线的方法。（课件播放微视频，学生边看边练习操作）看完后，教师重点强调让学生认识到操作三要素：重合、平移靠点、画线。三、 自主练习 让学生自己判断，巩固对垂直的认识。2. 下面哪两条线段是互相垂直的？3. 画出已知直线的垂线4.四、 回顾与反思本节课你有什么收获？和大家交流一下吧。五、 拓展作业： 用你学过的知识来设计一座桥梁吧，画一幅简图。结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而

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