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      歡迎來到原中小學教育資源網!

      五年級數學下冊《正方體》課件

      課件 時間:2017-06-23 我要投稿
      【www.51cxty.com - 課件】

        下面瑞文網小編為大家整理了五年級數學下冊《正方體》課件。

        【教學內容】人教版小學數學五年級下冊第20頁。

        【教材分析】 教材通過讓學生觀察正方體物品,抽象概括出正方體的特征,指出正方體是由6個完全相同的正方形圍成的立體圖形。比較長方體和正方體的相同點和不同點,說明正方體可以看成是長、寬、高都相等的長方體,并用集合圖表示它們的關系。比較時,可以按照面、棱、頂點的次序進行,教師整理后,利用集合圖說明長方體和正方體的關系。

        【教學目標】

        1、通過觀察和操作等教學活動,使學生認識正方體,掌握正方體的特征。

        2、通過觀察和比較,弄清長方體和正方體之間的聯系和區別。

        3、通過學習活動,培養學生的操作能力,發展學生的創新意識和空間觀念。

        【教學重點】長方體的特征及長、正方體的異同點。

        【教學難點】理解長方體和正方體之間的關系。

        【數學思想】歸納思想、比較思想。

        【教學過程】

        一、創設情境,引出問題

        教師活動

        學生活動及達成目標

        拿出上節課做好的長方體,組織交流,引導學生從面、棱、頂點三個方面來說。

        揭示課題:這節課我們來學習和研究正方體的特征,并板書課題。

        說說你知道它有什么特征。

        【達成目標:通過復習舊知,使學生在概括正方體的特征時,自然而然地從面、棱、頂點三個方面來觀察,激發學生的探究興趣。】

        二、共同探索,總結方法

        教師活動

        學生活動及達成目標

        一、探究正方體的特征。

        1、獨立觀察、合作探究。

        (1)組織學生匯報發現的正方體特征( 提示:面、棱、頂點、面的形狀、面積、棱長)

        (2)正方體還有一個名稱知道嗎?

        2、用填空的形式小結。

        二、探究長方體和正方體的關系

        1、組織討論交流。引導學生從面、棱、頂點三個方面來說,可以用列表法比較。

        2、提問:從比較中可以看出,正方體和長方體有什么關系?

        討論后用集合圖表示。

        拿出正方體物品,仔細觀察正方體的面、棱和頂點,看看有什么發現?

        同桌說一說,再全班匯報。

        立方體、

        學生回答:正方體是由(6)個(完全相同)的正方形圍成的(立體)圖形。正方體也有(12)條棱,它們的長度(相等)。正方體也有(8 )個頂點。

        【達成目標:讓學生主動利用遷移規律,通過多種感官的協同作用(看、摸、數、比、想),認識正方體面、棱、頂點的特點,從而對正方體有較全面的認識。】

        同桌合作:拿出一個長方體和一個正方體,討論一下,長方體和正方體有哪些相同點和不同點?

        再全班匯報。

        全班討論得出:長方體的所有特征,正方體都具備,可以說成是長、寬、高都相等的長方體,它是一種特殊的長方體。

        【達成目標:采用遞進式提出問題的教學策略,引發學生思考長方體和正方體的關系,學生在思考過程中必須對長方體和正方體的特征進行比較、歸納、整理,從而認識長方體和正方體的異同和關系,滲透歸納思想、比較思想。】

        三、運用方法,解決問題

        教師活動

        學生活動及達成目標

        課本20頁“做一做”:巡視指導,組織交流。

        同桌合作制作、討論,再匯報交流。(重點:搭一個稍大的正方體至少需要8個小正方體。)

        四、反饋鞏固,分層練習

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