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1,本文((2020新)北师大版四年级数学下册《2-小数的意义(二)》课件.ppt)为本站会员(晟晟文业)主动上传,163文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。
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(2020新)北师大版四年级数学下册《2-小数的意义(二)》课件.ppt

1、【2020新】北师大版四年级数学下册2-小数的意义(二)课件课后课后作业作业探索探索新知新知1课堂探究点课堂探究点2课时流程课时流程课堂课堂小结小结当堂当堂检测检测长长6分米。分米。宽宽45厘米。厘米。你能用米来表你能用米来表示吗?示吗?6分米分米0.6米米45厘米厘米0.45米米测量活动测量活动探究点探究点 根据小数的意义进行单位换算根据小数的意义进行单位换算黑板有多长?黑板有多长?1厘米厘米0.01米米36厘米厘米0.36米米鹌鹑蛋和鸵鸟蛋的质量分别是多少千克?鹌鹑蛋和鸵鸟蛋的质量分别是多少千克?1千克千克1000克克0.001千克千克0.012千克千克鹌鹑蛋的质量:鹌鹑蛋的质量:鸵鸟蛋的

2、质量:鸵鸟蛋的质量:0.5千克千克10.51.5千克千克小试牛刀小试牛刀(源于(源于典中点典中点)1想一想,填一填。想一想,填一填。(1)把把1分米平均分成分米平均分成100份,每份是份,每份是()毫米。毫米。分分米米分分米米 分分米米分分米米11000.01421000.42421(2)600 38 2 2 59 4 3 800 克克千千克克千千克克千千克克吨吨吨吨厘厘米米米米米米厘厘米米分分米米分分米米厘厘米米米米米米角角 分分元元元元米米千千米米千千米米0.60060010003810000.0380.020.20.590.430.8002100210591004310080010002

3、用小数表示下面的测量结果。用小数表示下面的测量结果。3.80.191.494.8003判断。判断。(对的画对的画“”,错的画,错的画“”)(1)3米米4厘米厘米3.4米米()(2)把用把用“克克”作单位的数改写成用作单位的数改写成用“千克千克”作单位的数,作单位的数,这个数就变大了。这个数就变大了。()(3)5元元6分分5.6元元()(4)6分分0.1时时()归纳总结:归纳总结:(讲解源于(讲解源于典中点典中点)将较小的度量单位转化成较大的度量单将较小的度量单位转化成较大的度量单位时,一定要弄清单位之间的进率是多位时,一定要弄清单位之间的进率是多少,从而确定小数部分的位数。少,从而确定小数部分

4、的位数。小试牛刀小试牛刀(教材(教材P5练一练)练一练)1.量一量,填一填。量一量,填一填。0.23米米0.17米米2.85米米1.1米米2.3米米0.8米米2.一只军舰鸟的体重约一只军舰鸟的体重约1千克千克600克,翼长克,翼长2米米1分米,骨骼分米,骨骼 重重113克。用小数怎么表示呢?克。用小数怎么表示呢?1千克千克600克(克()千克)千克2米米1分米(分米()米)米113克(克()千克)千克1.62.10.1133.2.537.50.513.60.7910.54.52厘米(厘米()米)米5.6米(米()米()米()分米)分米5元元6角角7分(分()元)元1.35米(米()元()元()

5、角)角()分)分0.52565.671355.0.3小时是多少分钟呢?想一想。小时是多少分钟呢?想一想。1时时60分分0.3时时60分分0.318分分易错辨析易错辨析4用小数表示下面各数。用小数表示下面各数。(1)一根竹竿长一根竹竿长26分米,也就是分米,也就是()米。米。(2)一块黑板的面积是一块黑板的面积是3平方米平方米2平方分米,合平方分米,合()平方米。平方米。2.63.02辨析:辨析:26分米分米2米米6分米,分米,6分米分米 米米0.6米,米,即为即为2.6米。米。610版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article incl

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