小学数学北师大四年级小数点搬家ppt.pptx

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,小数点搬家,Move the decimal point,北师大版四年级数学下册,0.04,元,0.40,元,4.00,元,4,分,4,角,4,元,10,10,小数点向左移一位,这个数就缩小到,原来的,10,10,100,100,小数点向左移两位,这个数就缩小到,原来的,小数点向左移两位,这个数就缩小到原来的,小数点向左移一位,这个数就缩小到原来的,小数点向左移三位,这个数就缩小到原来的,If the decimal point moves,one place,to the left.The decimal will be,ten times smaller,.,10,100,1000,If the decimal point moves,one place,to the right.The decimal will be,ten times bigger,。,0.285,扩大,10,倍,Ten times bigger,0.285,0.9,9,90,538,5380,53800,0.7810=0.810=,4.510=5.07100=,12.5100=12.6100=,34.71000=0.0071000=,7.8,0.45,1250,0.0347,0.08,507,0.126,7,14.14,100,3.69,314,61.8,181,0.987,0.04321,140,0.00001,0.31,（）,=31,1.29,（）,=1290,4.5,（）,=4500,2.7,（）,=0.027,20,（）,=0.002,商店批发来,100,张,60,分的邮票，,一共花去多少元？,3.51-3.59,