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1、名师精编优秀教案认识线段教学目标：1、让学生通过操作、观察建立线段的表象，会用自己的语言描述线段的主要特征，能把物体直的边看成线段，会数图形里的线段条数，并会画线段。2、培养学生在观察、操作中逐步思考、探究的意识和能力，发展空间观念。3、让学生在生动活泼的情境中乐于学习，能积极主动地参与学习活动，感受生活里的数学事实。教学重点：认识线段的特征。教学难点：线段表象的建立。教学过程：一、创设情境，生成问题。1、感受线段的“直”。教师带领学生观察桌面上的一条线（弯曲状）。提问：这根线是什么形状的？如果用手捏住线的两头，向两边一拉，这条线会变得怎样？（教师演示后让学生猜）学生自己动手拉紧曲线。提问：这
2、样拉出来的线与原来的那根线有什么不同？（板书：直的）谈话：把线拉直，两手之间的一段就是“线段”。线段都是直的。（板书：线段）名师精编优秀教案二、探索交流，解决问题。1、认识线段提问：你能说说线段有什么特点吗？生通过比较确认线段是直的。看看还有什么特点。谈话：两手捏住的地方，也就是线的两头就是线段的两端。同桌互指对方手中线段的两端。教师把线松开，提问：这还是线段吗？为什么？教师重新捏紧线的两端，竖着放，斜着放，都问一问：这是线段吗？请同桌每人捏住一条线段，以后我们还要学习量线段的长度。3、认识线段的图形。谈话：线段可以用图形来表示。（教师先画一条直的线）线段的两端我们该如何表示出来呢？我们可以在
3、它的两端各点上一个点或各画一条短短的线，这两个点就是线段的端点。（板书：）问：谁来指一指这条线段的端点？线段有几个端点？（板书：两个端点）4、小结线段的特征。谈话：同桌看着图形，说一说线段有什么特点。小结：线段是直的，有两个端点。5、找身边的线段。谈话：看来，小朋友们已经知道线段的特征，认识了线段的图形，文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4
4、E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3
5、N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M
6、2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8
7、I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10
8、T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY
9、6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1
10、Y8I4E3S4 ZT4M10T3N1L7名师精编优秀教案其实，在我们的生活中到处能找到线段。比如说吧，这本数学书上就有线段。拿起你的数学书，找一找，你觉得数学书的哪一条边可以看成是线段呢？学生上来指一指。提问：为什么这条边可以看成是线段呢？这条线段的两个端点在哪里？还有哪一条边也可以看成是线段？除了书的边可以看成是线段，还有很多物体的边也可以看成是一条线段。你能找一找吗？量一量课本第 5 页中间的三条线段长度，注意测量方法要正确。6、学生画线段。谈话：刚才我们一起认识了线段，还找到了线段，想自己动手画一条线段吗？请小朋友拿出纸，试着画一条线段。教师巡视，针对学生存在的问题加以指导。谈话：你是
11、用什么工具来画线段的？能举起来给大家看看吗？为什么这些工具都能画出线段呢？（突出线段是直的，这些工具都有直的边）请你来说一说你是怎么画线段的，还有别的方法吗？师：说说你是怎样画3 厘米长的线段。生回答，从 0 刻度线开始。三、巩固应用，内化提高。课本第 5 页做一做 1、2 文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1
12、L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T
13、3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4
14、E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3
15、N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M
16、2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8
17、I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10
18、T3N1L7名师精编优秀教案补充练习四、回顾整理，反思提升。今天我们有学习了新知识，谁能给大家介绍一下？、板书设计：认识线段特点：直的、两个端点、可测量。文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 H
19、L1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT
20、4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编
21、码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4
22、 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4
23、ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7文档编码:CY6M2T3C5G4 HL1Y8I4E3S4 ZT4M10T3N1L7