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角的初步认识

角的初步认识. 12. 9. 3. 6. (一)魔术表演,激趣引入. 先让我们看看 生活中的角吧!. (二)引导发现,活动探究. 顶 点. 边. 边. 边. 边. 顶 点. 总结:. 小小角,真简单,. 一个顶点两条边。. 画角时,要牢记,. 先画顶点再画边。. 第一关:慧眼识角. 数学游乐园. 判断:下面图形是不是角,如果是画 ? 不是画 ,并说说为什么?. (1) ( ). (2) ( ). (3) ( ). (4) ( ).

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角的初步认识

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  1. 角的初步认识

  2. 12 9 3 6 (一)魔术表演,激趣引入

  3. 先让我们看看 生活中的角吧! (二)引导发现,活动探究

  4. 顶 点 边 边 边 边 顶 点

  5. 总结: 小小角,真简单, 一个顶点两条边。 画角时,要牢记, 先画顶点再画边。

  6. 第一关:慧眼识角 数学游乐园

  7. 判断:下面图形是不是角,如果是画 ? 不是画 ,并说说为什么? (1) ( ) (2) ( ) (3) ( ) (4) ( ) (5) ( ) 幻灯片 14奖励

  8. 第二关:猜一猜 数学游乐园

  9. 猜一猜:下面哪个角大,哪个角小? 奖励

  10. 第三关:我会数 数学游乐园

  11. 数一数 :下面图形中各有几个角? 4个 3个 10个 奖励

  12. 第四关:巧手摆角 数学游乐园

  13. (1)摆一个角至少要几根小棒? (2)用三根小棒能摆几个角? 奖励

  14. 谢谢!

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