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      歡迎來到原中小學教育資源網!

      乘法的估算教學反思

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

        四月份,我們三年組到千金小學聽了一節數學課----《乘法估算》。一直覺得最難上的便是估算課,沒有標準的答案可言。學生的想法各異,甚至有的學生算出標準答案然后再進行估算,對估算的意義理解不夠。

        這節課從開課就努力創設問題情境,讓學生在已有的知識經驗基礎上進行數學活動,探索“兩位數乘兩位數的估算方法”,接著引導學生聯想日常生活中的情景,讓估算走進日常生活,逐步培養學生主動參與估算的興趣,而教學中教師的“適時點撥”也起到了“穿針引線”的作用,本節課達到了“人人學有價值的數學”的目標,是一節運用“情境教學”比較成功的課例。

        但本節課教學也有以下兩點值得思考:估算時,方法雖不確定,但必須符合以下兩個要求:一是符合實際,能否在課前安排學生多角度、多方位尋找生活中一些估算乘法的例子,使其更加貼近生活情境。二是計算方便。在具體的實例當中讓學生體會到估算的實用價值及意義,避免算出準確結果之后再估算。例如,本節課的題目是每排22個座位,一共18排,有350名學生來聽課,能坐下嗎?這道題共有三種估算方法,在本冊的估算中,第一次提到在生活中要正確合理的運用估算。22×18第一種:把18看成20,把22看成20.第二種:18看成20,22不動。第三種:18不動,把22看成20。經過學生間的激烈討論,大家你一言我一語各抒己見。在討論慢慢發現了第三種方法的優越性。符合實際又方便計算,體會到了估算帶給我們的便捷。

        其次,可否對學生提交的估算方法進行歸類。如:①有的估算時,是把兩位數看成小于原數的整十數,比如72看成70;②有的估算時,是把兩位數看成大于原數的整十數,如58看成60……。這樣,便于形成估算的靈活性.針對具體問題選擇正確的估算方法,例如,今天的這個例題結合問題的要求,把結果估小一些比較合適,

        因此,教學時要重視估算訓練,只有在實際情境中,才能產生多樣化的估算方法。單純地進行機械的估算訓練,是難以提高學生解決實際問題的能力的。只有結合日常生活進行訓練,體驗估算的方法,明確估算還應根據實際情況靈活應用,才能提高學生估算能力。

        鑒于以上的認識,我覺得學生估算習慣的培養與能力的提高很大程度上取決于教師的估算意識。在平時的教學中,我充分挖掘估算題材,在教學中重視進行估算示范,使學生認識到估算的必要性和優越性。積極創設生活情境,促使學生靈活采取估算策略。學生在教師預設的情境中意識到根據不同情況采用不同的估算策略,使學生的估算能力得到提高,并在自主探索中解決了問題。

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