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www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com小结:应用小数点移动引起小数大小变化的规律,可以把一个数扩大或缩小。下面各圈里的数同圈上的数比较,有什么变化?探索新知二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com(1)把0.07分别扩大到原来的10倍、100倍、1000倍,各是多少?0.07×10=0.07×100=0.07×1000=要解决这个问题,怎样列式呢?说一说你是怎么计算的。2探索新知二0.7770 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com小结:把0.7扩大到原来的10倍,就是乘10;把0.7扩大到原来的100倍,就是乘100;把0.7扩大到原来的1000倍,就是乘1000。实际上就是把0.7的小数点分别向右移动一位、两位、三位。探索新知二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com3.2÷10=0.323.2÷100=0.0323.2÷1000=0.0032(2)把3.2分别缩小到原来的、、,各是多少?100110001101说一说你是怎么计算的。探索新知二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com小结:把3.2缩小到原来的,就是除以10;把3.2缩小到原来的,就是除以100;把3.2缩小到原来的,就是除以1000。实际上就是把3.2的小数点分别向左移动一位、两位、三位。100110001101探索新知二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com1.把下面的数分别扩大到原来的10倍、100倍、1000倍。4.80.7354.8×10=484.8×100=4804.8×1000=48000.735×10=7.350.735×100=73.50.735×1000=73512.612.6×10=12612.6×100=126012.6×1000=12600巩固练习三教材做一做翼 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com2.把下面的数分别缩小到原来的、、。93.550093.5÷10=9.3593.5÷100=0.93593.5÷1000=0.09359999÷10=999.99999÷100=99.999999÷1000=9.9991011001100019999500÷10=50500÷100=5500÷1000=0.5巩固练习三教材做一做翼 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com巩固练习三3.教材P46T1 查看更多

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