《除數(shù)是整數(shù)小數(shù)除法》教學設計

1、除數(shù)是整數(shù)的小數(shù)除法教學設計 教學內(nèi)容：人教版小學數(shù)學教材五年級上冊第2425頁例1、例2、例3及“做一做”，練習六第16題。教學目標：1理解并掌握除數(shù)是整數(shù)的小數(shù)除法的計算方法，能正確計算除數(shù)是整數(shù)的小數(shù)除法。2培養(yǎng)學生的分析能力和類推能力。3體驗所學知識與現(xiàn)實生活的聯(lián)系，能應用所學知識解決生活中簡單的問題，從中獲得價值體驗。教學重點：理解并掌握除數(shù)是整數(shù)的小數(shù)除法的計算方法。教學難點：理解商的小數(shù)點定位問題。教學準備：將本課教學內(nèi)容制成PPT課件。教學過程：一、復習引入1用豎式計算：268÷4、224÷4、252÷6、345÷15。2說一說：224&

2、#247;4這道題是怎樣計算的？（教師適時板書或演示PPT課件。）3引入新課：這節(jié)課我們就用同學們掌握的整數(shù)除法的知識來學習新的知識?！驹O計意圖】通過復習整數(shù)除法，喚醒學生對整數(shù)除法計算方法和計算步驟的回憶，為新知的教學打好基礎。二、探究新知（一）教學例11出示例1，引導理解題意。（PPT課件演示。）（1）題目中告訴了我們什么？（堅持晨練可以鍛煉身體，王鵬堅持晨練，他計劃4周跑步22.4 km。）（2）題目中要我們求什么？（按計劃他平均每周應跑多少千米？）2嘗試列式，分析數(shù)量關系。（1）要求“他平均每周應跑多少千米”，應該怎樣列式？（學生口頭列式，教師板書或PPT課件演示：22.4÷

3、4。）（2）引導思考：為什么用“22.4÷4”？（路程÷時間速度）3揭示新課，感受學習價值。（1）請同學們觀察這道除法算式，和我們前面復習的除法計算有什么不同？（除數(shù)還是整數(shù)，但被除數(shù)是小數(shù)。）（2）揭示課題：看來，在實際生活中常常遇到需要用小數(shù)除法計算的問題，小數(shù)除法還是數(shù)學四則運算中的重要組成部分。從今天開始，我們就學習一個新的單元小數(shù)除法（板書單元課題：小數(shù)除法），這節(jié)課我們先學習除數(shù)是整數(shù)的小數(shù)除法。（板書本節(jié)課課題：除數(shù)是整數(shù)的小數(shù)除法。）4提出問題，自主思考算法。（1）提出問題：我們已經(jīng)會計算整數(shù)除法，那想一想，被除數(shù)是小數(shù)的除法該怎樣計算呢？（2）學生先獨立思

4、考，再在小組里交流自己的想法。（教師巡視，了解學生思維活動，參與小組交流，給予適當指導。）5教師引導，交流不同算法。（1）我們已經(jīng)會計算整數(shù)除法，在不改變商的大小的前提下，怎樣把小數(shù)變成整數(shù)呢？誰來說一說你的想法？（2）指名學生回答。（教師適時板書或PPT課件演示。）預設一：把被除數(shù)擴大到原來的10倍變成224，把除數(shù)也擴大到原來的10倍變成40，再來計算。（雖然變成了整數(shù)除以整數(shù)的形式，但在計算時仍然會遇到小數(shù)除法的問題，學生無法完成計算。）預設二：把22.4 km改寫成22400 m，再來計算。（3）交流對想法二的感受：這樣雖然可以算出結(jié)果，但是計算時你有什么感覺呢？ 6分步探討

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