1、分?jǐn)?shù)乘法(二) （建議兩課時(shí)完成） 五年級(jí)下冊(cè) 三 分?jǐn)?shù)乘法課后作業(yè)探索新知當(dāng)堂檢測(cè)課堂小結(jié)（1）求一個(gè)整數(shù)的幾分之幾是多少（2）求一個(gè)整數(shù)的幾分之幾的實(shí)際應(yīng)用1課堂探究點(diǎn)2課時(shí)流程北師大版五年級(jí)數(shù)學(xué)下冊(cè)一桶水有12L。3桶共多少升？123=36（升）就是求3個(gè)12是多少？用乘法計(jì)算：北師大版五年級(jí)數(shù)學(xué)下冊(cè)探究點(diǎn)1 求一個(gè)整數(shù)的幾分之幾是多少北師大版五年級(jí)數(shù)學(xué)下冊(cè)笑笑吃了多少塊餅干？答：笑笑吃了3塊餅干。北師大版五年級(jí)數(shù)學(xué)下冊(cè)淘氣吃了多少塊餅干？答：淘氣吃了4塊餅干。北師大版五年級(jí)數(shù)學(xué)下冊(cè)8的 是多少？畫(huà)一畫(huà)，算一算。北師大版五年級(jí)數(shù)學(xué)下冊(cè)1先涂色表示，再計(jì)算。8塊蛋糕的 是多少塊？列式計(jì)算：

2、( )涂色略。塊小試牛刀（源于典中點(diǎn)）北師大版五年級(jí)數(shù)學(xué)下冊(cè)2先涂色表示，再計(jì)算。8塊蛋糕的 是多少塊？列式計(jì)算：( )涂色略。塊北師大版五年級(jí)數(shù)學(xué)下冊(cè)3畫(huà)一畫(huà)，算一算。24的 是多少？列式計(jì)算：( )畫(huà)圖略。北師大版五年級(jí)數(shù)學(xué)下冊(cè) 4計(jì)算下列各題。北師大版五年級(jí)數(shù)學(xué)下冊(cè)整數(shù)乘分?jǐn)?shù)可以表示求幾個(gè)相同加數(shù)的和的簡(jiǎn)便計(jì)算，還可以表示求這個(gè)整數(shù)的幾分之幾是多少。求比一個(gè)數(shù)多幾分之幾是多少，用乘法計(jì)算，即用這個(gè)數(shù)乘幾分之幾。歸納總結(jié)：（講解源于點(diǎn)撥）北師大版五年級(jí)數(shù)學(xué)下冊(cè)1涂一涂，算一算。15的 是多少？8的 是多少？夯實(shí)基礎(chǔ)（教材P26練一練）北師大版五年級(jí)數(shù)學(xué)下冊(cè)2.奇思的身高大約是多少厘米？（m

3、）北師大版五年級(jí)數(shù)學(xué)下冊(cè)3.北師大版五年級(jí)數(shù)學(xué)下冊(cè)5下面的計(jì)算對(duì)嗎？不對(duì)的請(qǐng)改正。辨析：計(jì)算時(shí)忘記了約分。改正：易錯(cuò)辨析（選題源于典中點(diǎn)）北師大版五年級(jí)數(shù)學(xué)下冊(cè)探究點(diǎn)2 求一個(gè)整數(shù)的幾分之幾的實(shí)際應(yīng)用男生比女生多植樹(shù)多少棵？畫(huà)一畫(huà)，說(shuō)一說(shuō)你是怎樣理解的。女生：男生：20棵答：男生比女生多植樹(shù)5棵。你能再說(shuō)出一個(gè)類似的例子嗎？踢毽子比賽，小明踢了30下，小紅比小明多踢了 。小紅多踢了多少下？(下)答：小紅多踢了6下。1按要求解決問(wèn)題。五(1)班收集廢品36 kg，五(2)班比五(1)班多收集了 ，五(2)班比五(1)班多收集廢品多少千克？(1)這里是把( )班收集的廢品數(shù)看作單位“1”。(2)畫(huà)

4、線段圖表示題中的數(shù)量關(guān)系。五(1)小試牛刀（源于典中點(diǎn)）1按要求解決問(wèn)題。(3)列式解答：(4)請(qǐng)?jiān)偬岢鲆粋€(gè)類似的問(wèn)題并解答。kg答：五(2)班比五(1)班多收集廢品6 kg。略。2看圖列式計(jì)算。(1)(2)人3解決問(wèn)題。(1)王莊有40戶居民在“精準(zhǔn)扶貧”中脫貧，李莊脫貧的比王莊多 ，李莊比王莊多多少戶居民脫貧？戶答：李莊比王莊多5 戶居民脫貧。3解決問(wèn)題。(2)實(shí)驗(yàn)小學(xué)五年級(jí)有男生320人，女生比男生少 ，女生比男生少多少人？人答：女生比男生少120 人。3解決問(wèn)題。(3)陽(yáng)光小學(xué)共有學(xué)生960人，在本學(xué)期體質(zhì)健康檢查中合格的人數(shù)占總?cè)藬?shù)的 ，合格的學(xué)生共有多少人？人答：合格的學(xué)生共有84

5、0人。整數(shù)乘分?jǐn)?shù)可以表示求幾個(gè)相同加數(shù)的和的簡(jiǎn)便計(jì)算，還可以表示求這個(gè)整數(shù)的幾分之幾是多少。求比一個(gè)數(shù)多幾分之幾是多少，用乘法計(jì)算，即用這個(gè)數(shù)乘幾分之幾。歸納總結(jié)：（講解源于點(diǎn)撥）4國(guó)慶長(zhǎng)假的第一天，到鄉(xiāng)村農(nóng)家大院的游客有15 位，第二天來(lái)的游客比第一天多了 。第二天比 第一天多來(lái)了多少游客？夯實(shí)基礎(chǔ)（教材P27練一練）畫(huà)一畫(huà)，說(shuō)說(shuō)你是怎 樣理解的，并列式解 決問(wèn)題。(位)4國(guó)慶長(zhǎng)假的第一天，到鄉(xiāng)村農(nóng)家大院的游客有15 位，第二天來(lái)的游客比第一天多了 。第二天比 第一天多來(lái)了多少游客？夯實(shí)基礎(chǔ)（教材P27練一練）你還能舉出類似的例子嗎？與同伴交流。略6一個(gè)書(shū)包的原價(jià)是30元，打九折后的價(jià)格是多

6、少元？先說(shuō)一說(shuō)，再列式計(jì)算。請(qǐng)?jiān)倥e出一個(gè)能用此算式解決的問(wèn)題。(元)答：打九折后的價(jià)格是27元。7下表記錄的是某城市47月空氣質(zhì)量達(dá)標(biāo)的情況。4月5月6月7月空氣質(zhì)量達(dá)標(biāo)天數(shù)占本月天數(shù)的幾分之幾先估一估，哪個(gè)月空氣質(zhì)量達(dá)標(biāo)天數(shù)最多？再算出各有多少天。估計(jì)7月空氣質(zhì)量達(dá)標(biāo)天數(shù)最多。4月： （天）5月： （天）6月： （天）7月： （天）8一場(chǎng)洪災(zāi)將村里960m長(zhǎng)的公路沖毀了 ，被沖毀的公路長(zhǎng)多少米？(米)答：被沖毀的公路長(zhǎng)640米。9某種松鼠的體長(zhǎng)在20cm到28cm之間，它的尾巴約占體長(zhǎng)的 ，尾巴最長(zhǎng)約有多長(zhǎng)？最短約有多長(zhǎng)？(米)答：尾巴最長(zhǎng)約有21 cm。最短約有15 cm。(米)4李阿姨今

7、年42歲，樂(lè)樂(lè)的年齡是李阿姨的 ，歡歡的年齡是樂(lè)樂(lè)年齡的 ，樂(lè)樂(lè)、歡歡今年各幾歲？淘氣做得對(duì)嗎？如果不對(duì)，請(qǐng)更正過(guò)來(lái)。易錯(cuò)辨析（選題源于典中點(diǎn)）4李阿姨今年42歲，樂(lè)樂(lè)的年齡是李阿姨的 ，歡歡的年齡是樂(lè)樂(lè)年齡的 ，樂(lè)樂(lè)、歡歡今年各幾歲？辨析：沒(méi)有找準(zhǔn)分?jǐn)?shù)對(duì)應(yīng)的單位“1”。淘氣做得不對(duì)。樂(lè)樂(lè)年齡：歡歡年齡：1162歲歲版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownershi

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12、其他非商業(yè)性或非盈利性用途，但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利.除此以外，將本文任何內(nèi)容或服務(wù)用于其他用途時(shí)，須征得本人及相關(guān)權(quán)利人地書(shū)面許可，并支付報(bào)酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the prov

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14、cerned and the relevant obligee. 轉(zhuǎn)載或引用本文內(nèi)容必須是以新聞性或資料性公共免費(fèi)信息為使用目地地合理、善意引用，不得對(duì)本文內(nèi)容原意進(jìn)行曲解、修改，并自負(fù)版權(quán)等法律責(zé)任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the

15、 original intention of the content of this article, and shall bear legal liability such as copyright.版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用戶可將本文地內(nèi)容或服務(wù)用于個(gè)人學(xué)習(xí)、研究或欣賞，以及其他非商業(yè)性或非盈利性用途，但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)

16、法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利.除此以外，將本文任何內(nèi)容或服務(wù)用于其他用途時(shí)，須征得本人及相關(guān)權(quán)利人地書(shū)面許可，并支付報(bào)酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and o

17、ther relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant oblig

18、ee. 轉(zhuǎn)載或引用本文內(nèi)容必須是以新聞性或資料性公共免費(fèi)信息為使用目地地合理、善意引用，不得對(duì)本文內(nèi)容原意進(jìn)行曲解、修改，并自負(fù)版權(quán)等法律責(zé)任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the co

19、ntent of this article, and shall bear legal liability such as copyright.版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用戶可將本文地內(nèi)容或服務(wù)用于個(gè)人學(xué)習(xí)、研究或欣賞，以及其他非商業(yè)性或非盈利性用途，但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利.除此以外

20、，將本文任何內(nèi)容或服務(wù)用于其他用途時(shí)，須征得本人及相關(guān)權(quán)利人地書(shū)面許可，并支付報(bào)酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall

21、 not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 轉(zhuǎn)載或引用本文內(nèi)容必須是以新聞性或資料性公共免費(fèi)信

22、息為使用目地地合理、善意引用，不得對(duì)本文內(nèi)容原意進(jìn)行曲解、修改，并自負(fù)版權(quán)等法律責(zé)任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and sh

23、all bear legal liability such as copyright.版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用戶可將本文地內(nèi)容或服務(wù)用于個(gè)人學(xué)習(xí)、研究或欣賞，以及其他非商業(yè)性或非盈利性用途，但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利.除此以外，將本文任何內(nèi)容或服務(wù)用于其他用途時(shí)，須征得本人及相關(guān)權(quán)利

24、人地書(shū)面許可，并支付報(bào)酬.Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legiti

25、mate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 轉(zhuǎn)載或引用本文內(nèi)容必須是以新聞性或資料性公共免費(fèi)信息為使用目地地合理、善意引用，不得對(duì)本文內(nèi)容原意進(jìn)行曲解、

26、修改，并自負(fù)版權(quán)等法律責(zé)任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such

27、 as copyright.版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用戶可將本文地內(nèi)容或服務(wù)用于個(gè)人學(xué)習(xí)、研究或欣賞，以及其他非商業(yè)性或非盈利性用途，但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利.除此以外，將本文任何內(nèi)容或服務(wù)用于其他用途時(shí)，須征得本人及相關(guān)權(quán)利人地書(shū)面許可，并支付報(bào)酬.Users may use th

28、e contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website a

29、nd its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 轉(zhuǎn)載或引用本文內(nèi)容必須是以新聞性或資料性公共免費(fèi)信息為使用目地地合理、善意引用，不得對(duì)本文內(nèi)容原意進(jìn)行曲解、修改，并自負(fù)版權(quán)等法律責(zé)任.Reproduction or

30、 quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.用戶可將本文地內(nèi)容或服務(wù)用于個(gè)