2019-2020年三年級(jí)上冊(cè)1.8《三位數(shù)(末尾有0)乘一位數(shù)的筆算》word教學(xué)設(shè)計(jì).doc
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2019-2020年三年級(jí)上冊(cè)1.8《三位數(shù)(末尾有0)乘 一位數(shù)的筆算》word教學(xué)設(shè)計(jì) 一.教材分析 (一)教學(xué)內(nèi)容分析 三位數(shù)(中間有0)乘一位數(shù)的筆算是本單元三位數(shù)乘一位數(shù)的難點(diǎn)。本節(jié)課是在學(xué)生學(xué)習(xí)了三位數(shù)乘一位數(shù)的筆算方法的基礎(chǔ)上進(jìn)行教學(xué)的,首先進(jìn)行“0和任何數(shù)相乘都等于0”的教學(xué),然后再教學(xué)“一個(gè)因數(shù)中間有0的計(jì)算方法”。根據(jù)小貓釣魚的情境圖,結(jié)合本校是在下木村水庫(kù)邊這一實(shí)際情況,向?qū)W生進(jìn)行滲透法制教育《中華人民共和國(guó)水污染防治法》。 (二)教學(xué)對(duì)象分析 學(xué)生已學(xué)習(xí)了三位數(shù)乘一位數(shù)的筆算方法,解決了乘的順序和豎式寫法的問題,根據(jù)學(xué)生對(duì)這些知識(shí)的掌握情況,相信大部分學(xué)生會(huì)用舊知遷移新知,個(gè)別學(xué)生計(jì)算或書寫上會(huì)有困難。 二.教學(xué)目標(biāo) (一)知識(shí)目標(biāo) 掌握“0和任何數(shù)相乘都等于0”的規(guī)律;掌握一個(gè)因數(shù)中間有0的計(jì)算方法,理解算理。 (二)能力目標(biāo) 結(jié)合具體情景,能應(yīng)用所學(xué)知識(shí)解決學(xué)習(xí)中的簡(jiǎn)單問題,培養(yǎng)學(xué)生應(yīng)用意識(shí)和能力。 (三)情感目標(biāo) 滲透法制教育《中華人民共和國(guó)水污染防治法》第四十七條、第四十九條。 三.教學(xué)重難點(diǎn) (一)重點(diǎn) 掌握“0和任何數(shù)相乘都等于0”的規(guī)律。 (二)難點(diǎn) 理解一個(gè)因數(shù)中間有0的乘法的算理。 四.教學(xué)過程 (一)創(chuàng)設(shè)情景 1.口算:(小黑板出示) 3002 6002 6400 7900 203 303 400 設(shè)疑:400=0還是400=40?你能給出合理的解釋嗎? 【設(shè)計(jì)意圖:用“小黑板”出示口算題的情景誘發(fā)學(xué)生學(xué)習(xí)的興趣。銜接后面的數(shù)學(xué)問題。使得整個(gè)教學(xué)環(huán)節(jié)環(huán)環(huán)相扣,過渡順暢自然?!? 2.揭示研究問題:有關(guān)0的乘法 (二)探索新知 1.探索理解“0與任何數(shù)相乘都得0” (1)出示:例8小貓釣魚情境圖。 師:小黃貓、小紅貓、小藍(lán)貓又去河邊釣魚了,我們一起去看看它們今天又有什么收獲呢 (出示小貓釣魚圖) 師:3只小貓一共釣了多少條魚?你怎么看出來(lái)的?學(xué)生回答。 師:你能用加法算式表示嗎? 板書:0+0+0=0 你能改寫成乘法算式嗎?指名匯報(bào),學(xué)生回答。 板書:03=0或30=0 師:你是怎么知道得數(shù)是0的? 學(xué)生答出:因?yàn)?個(gè)0相加等于0,所以03=0。 2.滲透法制教育《中華人民共和國(guó)水污染防治法》 (1)第四十七條 使用農(nóng)藥,應(yīng)當(dāng)符合國(guó)家有關(guān)農(nóng)藥安全使用的規(guī)定和標(biāo)準(zhǔn)。運(yùn)輸、存貯農(nóng)藥和處置過期失效農(nóng)藥,應(yīng)當(dāng)加強(qiáng)管理,防止造成水污染。第四十九條 國(guó)家支持畜禽養(yǎng)殖場(chǎng)、養(yǎng)殖小區(qū)建設(shè)畜禽糞便、廢水的綜合利用或者無(wú)害化處理設(shè)施。畜禽養(yǎng)殖場(chǎng)、養(yǎng)殖小區(qū)應(yīng)當(dāng)保證其畜禽糞便、廢水的綜合利用或者無(wú)害化處理設(shè)施正常運(yùn)轉(zhuǎn),保證污水達(dá)標(biāo)排放,防止污染水環(huán)境。 (2)要求學(xué)生不能私自下河游玩、洗澡或撈魚,要求家長(zhǎng)不能亂打農(nóng)藥和亂排污水進(jìn)入水庫(kù)。 3.完成教材第21頁(yè)的“試一試”中的算式:07= 80= 00= 指名匯報(bào),說(shuō)說(shuō)你是怎么知道的? 教師:現(xiàn)在你知道400=0還是400=40?你能給出合理的解釋嗎? 4.小結(jié):0與任何數(shù)相乘都得0。 【設(shè)計(jì)意圖:提供學(xué)生獨(dú)立探究的空間,使學(xué)生經(jīng)歷0與任何數(shù)相乘都得0的計(jì)算過程。提供正確的計(jì)算,解決學(xué)生計(jì)算方法上的模糊認(rèn)識(shí)。提供觀察比較的機(jī)會(huì)。并根據(jù)小貓釣魚的情境圖,結(jié)合本校是在下木村水庫(kù)邊這一實(shí)際情況,向?qū)W生滲透法制教育《中華人民共和國(guó)水污染防治法》】 5.出示例9:體育館一個(gè)看臺(tái)有102個(gè)座位,4個(gè)這樣的看臺(tái)一共有多少座位? 師:一個(gè)看臺(tái)有102個(gè)座位,那么4個(gè)看臺(tái)有多少個(gè)座位呢?先請(qǐng)小朋友估計(jì)一下4個(gè)看臺(tái)大約有多少個(gè)座位? 師:說(shuō)說(shuō)你是怎樣想的?學(xué)生回答大約有400個(gè)。 師:他估計(jì)得對(duì)不對(duì)呢?請(qǐng)小朋友一起來(lái)算一算。指名一人板演。 1 0 2 4 4 0 8 師:指著十位上的0問:為什么十位上寫0?生回答因?yàn)槭簧?和4相乘得0。 師:看來(lái)4個(gè)看臺(tái)有408個(gè)座位,剛才小朋友估計(jì)得完全正確,你們可真厲害! 【設(shè)計(jì)意圖:使學(xué)生經(jīng)歷三位數(shù)(中間有0)乘一位數(shù)的筆算乘法的計(jì)算過程。提供正確規(guī)范的計(jì)算,解決學(xué)生計(jì)算方法上的失誤現(xiàn)象。】 (三)鞏固練習(xí) 1.第22頁(yè)的“想想做做”第2題。學(xué)生做在書上,指名4個(gè)學(xué)生板演,集體訂正得數(shù)。 師:為什么后面三道題目積的中間沒有“0”呢?學(xué)生回答:因?yàn)橛靡晃粩?shù)去乘被乘數(shù)的個(gè)位滿幾十,就要向十位進(jìn)幾。 引導(dǎo)觀察:今天計(jì)算的三位數(shù)乘一位數(shù)有什么共同的特點(diǎn)? 揭示課題:乘數(shù)中間有0的乘法。 2.“想想做做”第3題 出示題目,讓學(xué)生先找一找每個(gè)題錯(cuò)在哪里,再改正過來(lái),把正確的答案寫在旁邊。 學(xué)生獨(dú)立完成,集體訂正。 3.“想想做做”第5題。 (1)編2個(gè)中國(guó)結(jié)要用多少厘米?(學(xué)生獨(dú)立解答) (2)要求還剩下多少厘米?需要知道哪些條件?原來(lái)有多少?已經(jīng)用去了多少厘米? 4.“想想做做”第6題。 師:下面我們一起來(lái)看看第6題,說(shuō)說(shuō)你從圖中知道了哪些信息? 師:你能估計(jì)出3個(gè)書架大約有多少本書嗎?你是怎么估計(jì)出來(lái)的?指名學(xué)生回答。引導(dǎo)學(xué)生完成,訂正時(shí)讓學(xué)生說(shuō)說(shuō)是怎樣完成的? 【設(shè)計(jì)意圖:通過教學(xué)練習(xí)題,讓學(xué)生進(jìn)一步掌握三位數(shù)(中間有0)乘一位數(shù)的筆算方法,從而培養(yǎng)學(xué)生解決相應(yīng)實(shí)際問題的能力?!? (四)總結(jié) 1.師:同學(xué)們,今天你們學(xué)到了哪些知識(shí)? 2.請(qǐng)小朋友回想一下我們?cè)诠P算的時(shí)候要注意什么呢? (五)作業(yè) 完成第22頁(yè)第1、4題。 (六)板書設(shè)計(jì) 三位數(shù)(中間有0)乘一位數(shù)的筆算 0+0+0=0 03=0或30=0 1024=408(個(gè)) 1 0 2 4 4 0 8 五.教學(xué)反思 這一課是孩子們很容易犯錯(cuò)誤的地方。一個(gè)因數(shù)中間有0的乘法是學(xué)生學(xué)習(xí)乘法的一個(gè)難點(diǎn),在知識(shí)上學(xué)生已有多位數(shù)乘一位數(shù)計(jì)算方法的基礎(chǔ),因此本節(jié)課關(guān)鍵是0和任何數(shù)相乘都得0這一結(jié)論。通過教學(xué)后,我認(rèn)為比較成功地體現(xiàn)在以下兩點(diǎn): 第一、在情境創(chuàng)設(shè)上,從學(xué)生的生活實(shí)際出發(fā)。教學(xué)時(shí),通過讓學(xué)生自己探索情境圖,激發(fā)學(xué)生的學(xué)習(xí)興趣,學(xué)生算出3只小貓一共釣了多少條魚,根據(jù)乘法算式的意義得出03=0、30=0。聯(lián)系小貓釣魚這一問題情境,使他們感受到“問題”就存在于生活中,就存在身邊,每時(shí)每刻都會(huì)產(chǎn)生,而解決問題又是我們的需要,拉近了數(shù)學(xué)問題與學(xué)生情感的距離。練一練中的07=0、80=0和00=0是乘法的補(bǔ)充定義,通過讓學(xué)生思考交流加深對(duì)0和任何數(shù)相乘都得0的結(jié)論。 第二、在解決問題上。探究活動(dòng)中的教學(xué)是讓學(xué)生運(yùn)用類推的方法思考當(dāng)因數(shù)中間有0時(shí),如何計(jì)算,在這里將學(xué)習(xí)自主權(quán)留給了學(xué)生,培養(yǎng)學(xué)生的遷移類推能力。在學(xué)生自主探索過程中,教師及時(shí)針對(duì)學(xué)生存在的問題,讓學(xué)生在解決存在的問題中掌握正確的計(jì)算方法。對(duì)于學(xué)生問題意識(shí)的培養(yǎng)大有好處,因?yàn)檎n堂上學(xué)生的表現(xiàn)給了我較肯定的回應(yīng)。同時(shí)較大的空間也為學(xué)生提供了自己選擇的空間,體現(xiàn)了不同的學(xué)生學(xué)不同的數(shù)學(xué)的思想。 本班的學(xué)生對(duì)本節(jié)課所教學(xué)的知識(shí)掌握得比較好,但還有少數(shù)的同學(xué)在計(jì)算中出現(xiàn)了一些失誤,有些還掌握得不大好,也許是我教學(xué)經(jīng)驗(yàn)的還不足,因此我將在以后的教學(xué)中,不斷的自我學(xué)習(xí)、自我反思、自我總結(jié),以便能更好地勝任小學(xué)數(shù)學(xué)的教學(xué)工作。 附送: 2019-2020年三年級(jí)上冊(cè)3AM1Unit3Intheclassro om4課時(shí)表格式英文教案 Language focus: 1. Using formulaic expressions to greet people. e.g. Hello. 2. Asking Wh-questions to find out a person’s identity. e.g. What’s your name? 2. Using verbs to introduce oneself. e.g. I’m Danny. Language skills: Listening: a) Understand simple instructions. e.g. Colour your name card. b) Discriminate between words with different initial sounds e-,f-,g-,h-, Speaking: 1. Use modeled phrases to municate and elicit responses. e.g. What’s your name? 2. Open an interaction by eliciting a response. 3. Pronounce correctly words in isolation with initial sounds. e-, f-, g-, h-, and i- Materials: SB P8 cassette WB P4 ,35,36,37 Preparation: Say “Hello… Hi…”each other. Procedures Contents Methods Purpose Pre-task Preparation 1.What’ your name? I’m… 2.Explain: What’s= What is 1. Introduce: What’s your name? To elicit: I’m… 2. Practice the question and answer with students. 3. In pairs, the students practise the question and answer. 4. Play the cassette for P8. The students listen and repeat. Explain the contraction: What’s is the same as What is. 5. Select pairs to e out and act their dialogue. 強(qiáng)調(diào)What’s= What is While-task Procedure A relay race Have a relay race. Ask the student act the front of the first row: What’s your name? He /She answers: Hello, I’m…(name) while putting up his (her) hand. The chain continues down the row. Post-task activities Wookbook 1. Distribute all the name cards for the student’s Book characters used so far to groups. The rest of the group ask the students with name cards :”What’s your name?” The student then answers with the name of the character: I’m…and holds up the name card. 2. Workbook P4: a. Read the dialogues .Ask the students to supply the missing words orally. b. Ask individuals to e out and write the missing on the blackboard. Ask other students to correct any spelling mistakes. c. Students trace and write in the missing words in the book Learn the letters: 1. Play the cassette: Learn the letters: E “e” elephant. 2. The students listen and point in their books. 3. The students listen and repeat the sound. 4. Repeat the process. 5. Have the students enter the vocabulary in the relevant page of their personal vocabulary book. 6. workbook P35, 36 and 37. Handwriting practice for Ee, Ff, Gg, Hh, Ii 利用活頁(yè)人物認(rèn)識(shí)名字,再讓學(xué)生在班內(nèi)進(jìn)行問答操練。 Consolidation exercises Grammar Practice Book P5 Assignment 教后感:句型What’ your name?I’m…是本課重點(diǎn)。但是有個(gè)小的問題是以后會(huì)出現(xiàn)who are you?以后還是會(huì)出現(xiàn)問題的,所以在本節(jié)課中我預(yù)先埋伏了一下。 Unit 3 In the classroom (Second Period) Language focus: 1. Using verbs to describe conditions e.g. You’re… 2. Using formulaic expressions to confirm/deny identity e.g. Yes, I’m …/No, I’m … Language skills: Speaking: Use modelled phrases to municate and elicit a response Materials: SB P9,cassette , WB P5,Card, disponsable wooden chopsticks, scissors, sticky tape Photocopiable pages 2-6 and 8 Preparation: Collect sufficient card and disposable chopsticks to make character masks; scissors and sticky tape. Procedures Contents Methods Purpose Pre-task Preparation You’re… Yes. / No. 2.Read the dialogue. A. Write the names of the characters in the Student’s Book met so far on the board. Practise reading them. Explain given names and surmanes. B.1. Introduce: You’re … ; Yes; No. 2. Play the cassette for page 9. 3. The students listen and repeat. The students follow the dialogue in their books. 4. Read the dialogue. Play the cassette again, if necessary. 通過了解,介紹對(duì)方,為新課作鋪墊。 While-task Procedure Play the game 1. The students play the game in small groups at the front of the class. The students use their own names. 2. The students make masks for: Miss Fang; Kitty: Ben; Mr Li; Mrs Li; Mr chen; grandma; Alice. Photocipy and enlarge Photocopiable page 2 and page 8. Use Pieces of card to make masks , then mount them on a chopstick, using sticky tape. This will allow the students to hold the masks up. Play the game again, this time using the characters in the book, will small groups at the front of the class. 猜一猜的游戲操練句型。 Post-task activities Do exercises Workbook page 5 A. Review the letters a to f, Write the letters on the board B. Read the statements on p.5. The students find the relevant characters and the identifying letter. C. Read the stastement, Ask: What’s the letter? To elicit: a, b, etc. Consolidation Grammar Practice Book At this stage 3A page 5 could be used to practise and consolidate the oral and written language used in thid section further. Assignment Unit 3 In the classroom (Third Period) Language focus: 1. Using a formulaic rhyming expression to start a guessing game e.g. One, two, three, I see… 2. Using nouns to indefinite article to refer to something for the first time e.g. I see a book. 3. Usin formulaic expressions to affirm and deny e.g. Yes / No Language skills: Speaking: Open an interaction by eliciting a response Listening: Recognize differences in the use of intonation Materials: SB P10,cassette, Word and Picture Cards 3A, WB P6 Preparation: Ensure all the realia items are available. Procedures Contents Methods Purpose Pre-task Preparation Introduce: I see… Say: I see… Learn the new words Make sentences. A. Use the game format One, two, three, I see … to revise the students’ names and the characters (use picture cards). Say: One, two, three, see…; then look at an individual. The class must guess. Use as a chain drill; each student says: One, two, three, I see …; and looks at a classmate. The nest student must say that student’s name. B.1. Introduce the new vocabulary, using classroom realia and the picture cards 2. Practise the nouns by using flashcards and pointing to the items. 3. Encourage individual students to do the same. C.1. Introduce One, two, three … and practise the guessing game with the items. 2. Play the cassette for page 10. The students follow the dialogue in their books. 3. Explain use of indefinite article a. Encourage students to use the article before each noun. While-task Procedure Game: guessing 1. The students play the guessing game shown on page 10 as a class and/or group activity. 2. The students play the guessing game shown on page 10 as a class and/or group activity. Post-task activities Do exercises Workbook Page 6 A. Read the nouns on page6 B. The students trace with their finger, joining the pictures and the words. Walk round the class, checking that the students understand the task C. The students trace the words, join the objects and the words and color the objects. Consolidation Grammar Practice Book As the stage Grammar Practice Book 3A page 6 could be used to practise and consolidate the oral and written language in this section further Student’s self-assessment on P58. Assignment ” 教后感:這是一個(gè)韻律的兒歌,讀起來(lái)比較容易上口,但其實(shí)還是有很大難度的,單詞的掌握,以及祈使句的新接觸都是重點(diǎn)。 Unit 3 In the classroom (Fourth Period) Language focus: Review and check the knowledge of this unit. Materials: SB P8--10, cassette, WB,Practise and Assessment Preparation: Play a game: “One,two,three…I see…” Procedures Contents Methods Purpose Pre-task Preparation Review: Words and sentences 1. Open the students’book to P8—10, let students read the words and sentences. 6. Listen to the tape and follow it. 7. Practise in pairs: What’s your name? I’m… You’re… Yes,I’m…/No,I’m… I see… Consolidation exercises 1. Oxford English Practice and Assessment Series (Module1Unit3 A:Look and write E:Listen and draw F:Read and match) 2. 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