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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,教学目标,本节课我们主要来学习小数点的移动,对小数的大小会产生哪些影响,同学们要积极主动的探索并总结你发现的规律。,教学目标本节课我们主要来学习小数点的移动,对小数的大小会产生,1,扩大到原来的,100,倍,扩大到原来的,10000,倍,缩小到原来的,1,10,缩小到原来的,1,100,285,我会说,:,28500,缩小到原来的,1000,1,46,82000,90000,1300,130,460000,820,90,扩大到原来的100倍扩大到原来的10000倍缩小到原来的11,2,3,4,5,6,单位,:,元,单位,:,元,单位,:,元,单位:元单位:元单位:元,7,0.00,元,0.5,5,每颗,:,0.00元0.55每颗:,8,0.00,元,0.50,元,0.80,每颗,:,0.00元0.50元0.80每颗:,9,0.00,元,.00,元,每颗,:,0.00元.00元每颗:,10,0.80,元,8,80,每个,:,0.80元880每个:,11,0.80,元,8.00,元,完成,每个,:,0.80元8.00元完成每个:,12,0.80,元,80.00,元,每个,:,0.80元80.00元每个:,13,我会摆,:,.,缩小到原来的,1,10,我会摆:.缩小到原来的110,14,我会摆,:,.,缩小到原来的,1,10,我会摆:.缩小到原来的110,15,我会摆,:,.,1,缩小到这个数的,100,我会摆:.1缩小到这个数的100,16,我会摆,:,.,1,缩小到这个数的,100,我会摆:.1缩小到这个数的100,17,我会摆,:,.,0,1,缩小到这个数的,100,我会摆:.0 1缩小到这个数的100,18,我会摆,:,.,0,扩大到这个数的,10,倍,我会摆:.0扩大到这个数的10倍 ,19,我会摆,:,.,0,扩大到这个数的,10,倍,我会摆:.0 扩大到这个数的10倍,20,我会摆,:,.,扩大到这个数的,10,倍,我会摆:.扩大到这个数的10倍,21,我会摆,:,扩大到这个数的,1000,倍,.,我会摆:扩大到这个数的1000倍 .,22,我会摆,:,.,扩大到这个数的,1000,倍,我会摆:.扩大到这个数的1000倍,23,我会摆,:,.,0,扩大到这个数的,1000,倍,我会摆:.0 扩大到这个数的1000倍,24,我会摆,:,.,0,扩大到这个数的,1000,倍,我会摆:.0扩大到这个数的1000倍,25,我会摆,:,0,扩大到这个数的,1000,倍,我会摆:0扩大到这个数的1000倍,26,我会摆,:,6180100=,61.8,61.81000=,0.0618,0.061810000=,618,我会摆:6180100=61.861.81000=,27,我会选:,(1),把,0.3,的小数点向右移动两位,这个数就扩大到,原来的,(,),。,10,倍,100,倍,1000,倍,10000,倍,我会选:,28,我会选:,(2),把,8.72,的小数点向左移动一位,得,(,),。,0.872,0.0872,87.2,872,我会选:,29,我会选:,(3),把,42.5,的小数点向左移动三位,这个数就,(),。,扩大到原来的,100,倍,扩大到原来的,1000,倍,缩小到原来的,缩小到原来的,1000,1,100,1,我会选:100011001,30,我会选:,(4),把,0.105,的小数点向右移动两位,这个数就,(),。,扩大到原来的,100,倍,扩大到原来的,1000,倍,缩小到原来的,缩小到原来的,1000,1,100,1,我会选:100011001,31,我会选:,(5),把一个小数扩大到原来的,1000,倍,可以通过把小数点,(),得到。,向左移动两位,向左移动三位,向右移动两位,向右移动三位,我会选:,32,我会选:,(6),把,0.06,的小数点去掉,这个数就,(),。,扩大到原来的,100,倍,扩大到原来的,1000,倍,缩小到原来的,缩小到原来的,1000,1,100,1,我会选:100011001,33,我会选:,(7),把最大的三位数缩小到原来的 ,得,(,),。,99.9,9.99,0.999,0.0999,1000,1,我会选:10001,34,18.510=,71.2100=,23100,0=,0.61000=,0.84100=,3.9100=,390,1.85,600,0.712,84,0.023,18.510=71.2100=231000=0.61,35,2.85,0.00285,0.0285,28.5,2850,扩大到原来的,10,倍,扩大到原来的,10000,倍,扩大到原来的,100,倍,缩小到原来的,1,10,缩小到原来的,1,100,0.285,我会说,:,2.850.002850.028528.52850扩大到原来,36,我会算:,1.6410=,3.7100=,5.121000=,20.8100=,0.61000=,18.210=,7.2100=,231000=,5.9100=,650.11000=,我会算:,37,
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