《除數(shù)是整數(shù)的小數(shù)除法》教學(xué)設(shè)計(jì)

1、除數(shù)是整數(shù)的小數(shù)除法教學(xué)設(shè)計(jì) 教學(xué)內(nèi)容：人教版小學(xué)數(shù)學(xué)教材五年級(jí)上冊(cè)第2425頁(yè)例1、例2、例3及“做一做”，練習(xí)六第16題。教學(xué)目標(biāo)：1理解并掌握除數(shù)是整數(shù)的小數(shù)除法的計(jì)算方法，能正確計(jì)算除數(shù)是整數(shù)的小數(shù)除法。2培養(yǎng)學(xué)生的分析能力和類推能力。3體驗(yàn)所學(xué)知識(shí)與現(xiàn)實(shí)生活的聯(lián)系，能應(yīng)用所學(xué)知識(shí)解決生活中簡(jiǎn)單的問題，從中獲得價(jià)值體驗(yàn)。教學(xué)重點(diǎn)：理解并掌握除數(shù)是整數(shù)的小數(shù)除法的計(jì)算方法。教學(xué)難點(diǎn)：理解商的小數(shù)點(diǎn)定位問題。教學(xué)準(zhǔn)備：將本課教學(xué)內(nèi)容制成PPT課件。教學(xué)過程：一、復(fù)習(xí)引入1用豎式計(jì)算：268÷4、224÷4、252÷6、345÷15。2說一說：224&

2、#247;4這道題是怎樣計(jì)算的？（教師適時(shí)板書或演示PPT課件。）3引入新課：這節(jié)課我們就用同學(xué)們掌握的整數(shù)除法的知識(shí)來學(xué)習(xí)新的知識(shí)?！驹O(shè)計(jì)意圖】通過復(fù)習(xí)整數(shù)除法，喚醒學(xué)生對(duì)整數(shù)除法計(jì)算方法和計(jì)算步驟的回憶，為新知的教學(xué)打好基礎(chǔ)。二、探究新知（一）教學(xué)例11出示例1，引導(dǎo)理解題意。（PPT課件演示。）（1）題目中告訴了我們什么？（堅(jiān)持晨練可以鍛煉身體，王鵬堅(jiān)持晨練，他計(jì)劃4周跑步22.4 km。）（2）題目中要我們求什么？（按計(jì)劃他平均每周應(yīng)跑多少千米？）2嘗試列式，分析數(shù)量關(guān)系。（1）要求“他平均每周應(yīng)跑多少千米”，應(yīng)該怎樣列式？（學(xué)生口頭列式，教師板書或PPT課件演示：22.4÷

3、4。）（2）引導(dǎo)思考：為什么用“22.4÷4”？（路程÷時(shí)間速度）3揭示新課，感受學(xué)習(xí)價(jià)值。（1）請(qǐng)同學(xué)們觀察這道除法算式，和我們前面復(fù)習(xí)的除法計(jì)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(shí)際生活中常常遇到需要用小數(shù)除法計(jì)算的問題，小數(shù)除法還是數(shù)學(xué)四則運(yùn)算中的重要組成部分。從今天開始，我們就學(xué)習(xí)一個(gè)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(xué)習(xí)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(huì)計(jì)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(jì)算呢？（2）學(xué)生先獨(dú)立思

4、考，再在小組里交流自己的想法。（教師巡視，了解學(xué)生思維活動(dòng)，參與小組交流，給予適當(dāng)指導(dǎo)。）5教師引導(dǎo)，交流不同算法。（1）我們已經(jīng)會(huì)計(jì)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(xué)生回答。（教師適時(shí)板書或PPT課件演示。）預(yù)設(shè)一：把被除數(shù)擴(kuò)大到原來的10倍變成224，把除數(shù)也擴(kuò)大到原來的10倍變成40，再來計(jì)算。（雖然變成了整數(shù)除以整數(shù)的形式，但在計(jì)算時(shí)仍然會(huì)遇到小數(shù)除法的問題，學(xué)生無法完成計(jì)算。）預(yù)設(shè)二：把22.4 km改寫成22400 m，再來計(jì)算。（3）交流對(duì)想法二的感受：這樣雖然可以算出結(jié)果，但是計(jì)算時(shí)你有什么感覺呢？ 6分步探討

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