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      歡迎來到原中小學教育資源網!

      《兩位數乘兩位數的進位乘法》教案

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

        【教學目標】

        1.讓學生經歷兩位數乘兩位數的筆算過程,學會計算兩位數乘兩位數進位的乘法。

        2.在學習活動中感受數學與生活的密切聯系。

        【教學過程】

        一、出示情境圖,提出問題

        師:同學們你們喜歡下圍棋嗎?

        呈現下圍棋的畫面,介紹有關圍棋賽的事例(或戰績)。讓學生觀察棋盤結構。使學生了解到:圍棋的棋盤面由縱橫19道線交叉組成。引出問題:“棋盤上一共有多少個交叉點?”請學生說一說用什么方法解決這個問題,從而列出算式19×19。

        二、探討計算方法

        1.各組討論:怎樣計算19×19。

        請把想出的計算方法寫在紙上。

        2.組織交流。

        各組展示本組的算法。不容易說清楚的,就寫在黑板上。

        3.師生評議。教師展示三種計算的方法。

        (1)請學生說一說,喜歡哪種方法?為什么?

        (2)教師對學生發表的意見作以肯定或補充。使學生了解每一種算法的特點和適用范圍。例如:估算的方法能很快算出大約有400個交叉點,但它不能滿足解決問題的要求。

        (3)重點評議筆算。

        用檢查豎式每一步計算的方式,再現筆算過程。在此基礎上,夸贊學生:能用剛學過的兩位數乘兩位數的知識解決今天的新問題。并且,能正確解決乘的過程中的進位問題。你們真棒!

        三、練習

        1.嘗試練習。

        用豎式計算第65頁“做一做”中的4道題。可以讓幾個組的學生做前2道,另幾個組的學生做后2道題。

        完成計算后,組織交流。說出筆算的過程,加深學生對筆算過程的了解。

        2.完成練習十六第1題。

        獨立計算,集體訂正。根據班上出現錯題的情況,和學生一起討論錯誤的原因,請學生訂正錯題。請學生注意:計算時要認真仔細。

        四、總結

        1.請學生討論筆算乘法時要注意什么問題,并交流。

        2.教師強調:用豎式計算時,每次乘得的數的末位應該和哪一位對齊。還要注意記住進位數,正確處理進位問題。

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