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1、小数的产生和意义,0.90元,2.85元,5.98元,我的身高是1.41米。,我的体重是39.4千克。,学习目标,1、经历实际测量等活动,了解小数产生的过程。2、理解小数的意义,认识小数的计数单位和相邻两个计数单位的进率。,1分米,0.1米,3分米,0.3米,7分米,0.7米,一 位 小 数,1厘米,0.01米,3厘米,0.03米,6厘米,0.06米,两 位 小 数,1厘米,0.001米,0.006米,0.013米,三 位 小 数,1毫米,6毫米,13毫米,1,10,0.1,10,0.3,10,0.7,3,7,一 位小数,1,100,0.01,100,0.03,100,0.06,3,6,两位小
2、数,1,1000,0.001,1000,0.006,1000,0.013,6,13,三 位小数,分母是10、100、1000的分数可以用小数表示。,分数:,小数:,做一做,0.6,0.7,0.32,0.3里面有()个,0.5里面有()个,0.07里面有()个,0.26里面有()个,小数的计数单位是十分之一,百分之一,千分之一分别写作0.1,0.01,0.001,3,5,7,26,填一填,1,10,1,100,1,100,1,10,10,10,每相邻两个计数单位间的进率是,10,0.56里面有()个0.01,1里面有()个0.1,0.9里面有()个0.1,56,728,你能回答小鸟们的问题吗?,1里面有()个0.01,1里面有()个0.001,0.05里面有()个0.01,10,100,1000,9,5,0.728里面有()个0.001,10,3,1000,15,100,29,0.3,0.15,0.015,100,15,连一连,0.29,小数的产生和意义,小 小 裁 判 员,5、小数都比1小。,4、10个 等于1个,。,3、0、37里面有37个0、01。,2、45毫米=米=0、45米,1、每两个计数单位之间的进率都是10。,(),(),(),),对口令,同桌两人,一人说分母是10、100、1000的分数,另一人说出小数,然后互调。,再见,