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      歡迎來到原中小學教育資源網!

      小學生數的運算課件

      課件 時間:2018-04-05 我要投稿
      【www.51cxty.com - 課件】

        小學生數的運算課件應該要怎么寫呢?我們不妨一起來參考下范文吧!希望對您有所幫助!以下是小編為您搜集整理提供到的小學生數的運算課件內容,希望對您有所幫助!歡迎閱讀參考學習!

        小學生數的運算課件

        教學內容:

        教材安排了三個層次的整理和復習。

        第一層次給出了兩個供小組討論交流的問題,要求學生舉例說明運算意義,并對整數、小數、分數的計算方法進行比較,找出它們的共同點和不同點。這里,教材通過兩個同學討論過程中的對話片段,對比較四則計算方法的異同點作了一些提示,以促進學生舉一反三,繼續展開討論。

        第二層次主要復習混合運算順序、運算定律和簡便運算。教材先讓學生通過填表,對所學的五條運算定律進行整理。

        第三個層次主要復習用算術方法解決問題的一般思路和步驟。

        教學目標:

        1、通過復習練習,進一步掌握整數、分數、小數加減法的計算方法以及內在聯系。

        2、通過復習練習,進一步鞏固四則混合運算的計算方法。

        3、能正確進行口算、筆算和估算,提高計算能力。

        重點難點:

        四則運算方法、四則混合運算方法。

        教具學具:

        相關練習題

        教法指導:

        1、教學問題1時,著重讓學生自己舉例說明四則運算的含義,并相互交流。減法、除法運算的各種具體情況,不必求全

        2、整理0和1在四則運算中的特性時,可以先讓學生獨立完成第81頁上的填空,再交流、核對答案。

        3、第80頁上的“做一做”,可以讓學生獨立完成,核對答案后再讓學生說說計算時需要注意什么。也可以先讓學生看題說一說,根據以往的計算經驗,你認為應該提醒同學注意什么,然后再各自完成計算。

        4、復習運算定律時,不妨先讓學生獨自把教科書第81頁表中的空格填完,再作交流。通常,教師會讓學生用語言敘述這五條運算定律,這當然是可以的,但不要強求話語的統一,更不宜讓學生去死記硬背。教師可以指出,加法交換律、結合律能綜合運用于連加運算,加數經過交換、結合,運算符號不變,還是連加。乘法交換律、結合律也相類似。只有乘法分配律涉及乘加或乘減兩種運算。

        5、教學例1前,可先請學生回想并說說四則混合運算順序有哪些規定。然后針對例1說說按順序應該先算什么、再算什么,本題能否利用運算定律使計算簡便。要使學生明白,這題是求兩個積的和,而且有相同因數,所以可逆向運用乘法分配律使計算簡便。接著,讓學生自己在課本上寫出例1的計算過程。也可以由學生先算,再交流、小結。

        6、第81頁上的“做一做”可以先做再說。說的意圖是明確一般情況下按運算順序計算。當運算與數據都具備簡便運算條件時,可根據運算定律進行簡便運算。“做一做”的左邊一題既有加、減法,又有除法,按運算順序的規定算。右面一題是連乘,可以根據乘法交換律、結合律讓學生直接在算式上跨越約分。

        作為五條運算定律在運算過程中的運用,教材的例1是逆向運用乘法分配律(a+b)c=ac+bc的一個例子(乘法分配律的順向運用安排在練習中)。同頁上“做一做”的右邊一題是運用乘法交換律、結合律的一個例子。加法交換律、結合律的運用就不再舉例了。

        7、在教學解決問題的步驟時,可以先引導學生復習前面學習的四則運算的意義及利用四則運算解決簡單的問題,使學生明確計算是解決問題的主要手段,并引導學生整理解答過程。然后結合例2的教學總結解決問題的一般步驟。

        教學過程:

        一、復習回顧,整理與復習四則運算

        1、提問:四則運算是指哪四則?怎樣計算整數四則運算?小數四則運算呢?與整數四則有何聯系?怎樣計算分數四則運算?(思考,不必回答)

        2、獨立完成書上第87 頁上第1題口算。

        3、結合口算題,回答剛才的問題。教師總結。

        4、獨立完成第87頁上第4題:筆算指名板演,結合板演題,分析計算情況。

        5、復習估算:獨立完成書上第3題。說說估算方法。

        6、第2題:獨立完成,再比較上下兩題有哪些相同的地方?哪些不同的地方?

        二、新知學習,解決問題

        (一)第5題

        1、讀要求,理解要求含義

        2、讀題目,分析每題的解答方法,列出算式。

        3、判斷每題的計算方法,確定是口算、筆算還是用計算器計算?怎樣進行估算?組織學生分析交流。

        (二)第6題

        1、讀題后獨立完成。

        2、組織交流。

        3、要求學生再提問題,獨立解答。

        三、整理復習四則混合運算

        1、提問:如果將四則運算混合在一起,就變成四則混合運算,在計算時,運算順序是怎樣的?(引導學生分有括號與沒有括號進行分析)

        四則混合運算順序在整數、分數、小數中都同樣適用。

        2、計算:書上第89頁上第1題

        學生獨立完成,指名板演,結合扮演題分析校對。

        3、補充四則混合運算應用題

        (1)紅花襯衫廠要制做一批襯衫,原計劃每天生產400件,60天完成。實際每天生產的件數是原計劃每天生產件數的1.5倍。完成這批襯衫的制做任務,實際用了多少天?

        (2) 東風機器廠原計劃每天生產240個零件,18天完成。實際比原計劃提前3天完成,實際每天比原計劃每天多生產多少個零件?

        四、鞏固提高

        練習十四1、2、3、4

        練習十四5、6

        五、小結

        引導學生對數的運算的知識進行系統梳理。

        六、習題設計

        練習十四8

        板書設計:

        數的運算

        加法 減法 乘法 除法

        加數+加數=和 被減數-減數=差 因數X因數=積 被除數÷除數=商

        和-一個加數=兩一個加數 被減數-差=減數 積÷一個因數=另一個因數 被除數÷商=除數

        差+減數=被減數 商×除數=被除數。

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