1、小数点搬家,Move the decimal point,北师大版四年级数学下册,教学目标,本节课我们主要来学习小数点搬家，同学们通过山羊快餐店的实际例子理解并掌握小数点移动会引起小数的大小怎么样的变化，能够解决相关的实际问题。,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 t
2、o 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,
