1、 小數(shù)的意義（二）（建議一課時(shí)完成）第一單元 小數(shù)的意義和加減法 四年級(jí)下冊(cè) 課后作業(yè)探索新知根據(jù)小數(shù)的意義進(jìn)行單位換算1課堂探究點(diǎn)2課時(shí)流程課堂小結(jié)當(dāng)堂檢測(cè)長(zhǎng)6分米。寬45厘米。你能用米來(lái)表示嗎？6分米0. 6米45厘米0.45米測(cè)量活動(dòng)探究點(diǎn) 根據(jù)小數(shù)的意義進(jìn)行單位換算黑板有多長(zhǎng)？1厘米0.01米36厘米0.36米鵪鶉蛋和鴕鳥(niǎo)蛋的質(zhì)量分別是多少千克？1千克1000克0.001千克0.012千克鵪鶉蛋的質(zhì)量：鴕鳥(niǎo)蛋的質(zhì)量：0.5千克10.51.5千克小試牛刀（源于典中點(diǎn)）1想一想，填一填。(1) 把1分米平均分成100份，每份是()毫米。11000.01421000.42421(2)0.60

2、060010003810000.0380.020.20.590.430.8002100210591004310080010002用小數(shù)表示下面的測(cè)量結(jié)果。94.8003判斷。(對(duì)的畫(huà)“”，錯(cuò)的畫(huà)“”)(1)3米4厘米3.4米()(2)把用“克”作單位的數(shù)改寫(xiě)成用“千克”作單位的數(shù)，這個(gè)數(shù)就變大了。()(3)5元6分5.6元()(4)6分0.1時(shí)()歸納總結(jié)：（講解源于典中點(diǎn)） 將較小的度量單位轉(zhuǎn)化成較大的度量單位時(shí)，一定要弄清單位之間的進(jìn)率是多少，從而確定小數(shù)部分的位數(shù)。小試牛刀（教材P5練一練）量一量，填一填。0.23米0.17米2.85米1.1米2.3米0.8米一只軍艦

3、鳥(niǎo)的體重約1千克600克，翼長(zhǎng)2米1分米，骨骼 重113克。用小數(shù)怎么表示呢？1千克600克（ ）千克2米1分米（ ）米113克（ ）千克133.2.537.50.513.60.7910.54.52厘米（ ）米5.6米（ ）米（ ）分米5元6角7分（ ）元1.35米（ ）元（ ）角 （ ）分0.52565.671350.3小時(shí)是多少分鐘呢？想一想。1時(shí)60分0.3時(shí)60分0.318分易錯(cuò)辨析4用小數(shù)表示下面各數(shù)。(1)一根竹竿長(zhǎng)26分米，也就是()米。(2)一塊黑板的面積是3平方米2平方分米，合( )平方米。2.63.02辨析：26分米2米6分米，6分米 米0.6米，即為2.

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18、er 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 quotation of the content of this article must be reasonable and good-faith citation for the use o

19、f 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. Co

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21、poses, 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 and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permissi

22、on 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 quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public

23、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

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25、they shall abide by the provisions of copyright law and other 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

26、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 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 no

27、t 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)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