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      歡迎來到原中小學教育資源網!

      數學三角形的認識教學反思

      教學反思 時間:2019-07-04 我要投稿
      【www.51cxty.com - 教學反思】

        案例:

        師:剛才我們認識了三角形,拿出我們準備好的長度分別為10cm,6cm,5cm,4cm的四根小棒,任意選三根圍一圍,看著能否圍成三角形。

        生:操作實踐。

        師:你們都圍成了三角形了嗎?怎么圍的?

        生:演示。

        師:圍的圖形是不是三角形?你發現三角形的三條邊的長度有什么關系?

        生:根據實驗,說出三條邊的關系。

        師:(小結)三角形的兩條邊長度的和大于第三邊。

        反思:

        通過動手實踐,自己探索,比較交流等活動,主動地獲得了數學知識和技能。加強數學知識與生活實際的聯系,培養了應用意識和實踐能力。但在教學中,注意教具的四根小棒的粗細,盡量都細一些,防止操練中出現誤差,早成影響,對于學生的探索成功起到了重要的作用。<

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