小數(shù)點(diǎn)搬家

1、小數(shù)點(diǎn)搬家,01,.,0,,,,,,,1,0,.,0.01,,0.1,01,01,.,0,0.01×10=0.1,0.1是0.01的十倍,0.01,,1,0.01×100=1,1是0.01的100倍,☆小數(shù)點(diǎn)向右移動一位，這個數(shù)將擴(kuò)大到原來的_____倍　　 ☆小數(shù)點(diǎn)向右移動兩位,這個數(shù)將擴(kuò)大到原來的_____倍　☆小數(shù)點(diǎn)向右移動三位，這個數(shù)將擴(kuò)大到原來的_____倍,10,100,1000,,小數(shù)點(diǎn)向右移

2、動,原數(shù)變化的規(guī)律:,……,,23.5→2.35，小數(shù)點(diǎn)向（ ）移動（ ）位。,左,1,,,0.56→56，小數(shù)點(diǎn)向（ ）移動（ ）位。,右,2,,,100→1，小數(shù)點(diǎn)向（ ）移動（ ）位。,左,2,,,移一移,比一比,下面這些數(shù)與0.285比較,擴(kuò)大到原來的幾倍?,0.285,小數(shù)點(diǎn)向 移動了 ,0.285擴(kuò)大到原來的 倍,,,,右,一位,10,2.85,0.2

3、85,練一練,下面這些數(shù)與0.285比較,擴(kuò)大到原來的幾倍或縮小到原來的幾分之一?,小數(shù)點(diǎn)向 移動了 ,0.285擴(kuò)大到原來的 倍,,,,右,兩位,100,28.5,0.285,練一練,下面這些數(shù)與0.285比較,擴(kuò)大到原來的幾倍或縮小到原來的幾分之一?,,,,小數(shù)點(diǎn)向 移動了 ,0.285擴(kuò)大到原來的 倍,右,四位,10000,,2850,小數(shù)點(diǎn)向

4、左移動,原數(shù)變化的規(guī)律:,1 0.1,1 0.01,1 0.001,,小數(shù)點(diǎn)向左移動一位，這個數(shù)就縮小到原來的,,,小數(shù)點(diǎn)向左移動兩位，這個數(shù)就縮小到原來的,小數(shù)點(diǎn)向左移動三位，這個數(shù)就縮小到原來的,……,練一練,下面這些數(shù)與0.285比較,擴(kuò)大到原來的幾倍或縮小到原來的幾分之一?,小數(shù)點(diǎn)向 移動了 ,0.285擴(kuò)大(或縮小到原來的),,

5、,,左,一位,,0.0285,0.285,,練一練,下面這些數(shù)與0.285比較,擴(kuò)大到原來的幾倍或縮小到原來的幾分之一?,0.285,小數(shù)點(diǎn)向 移動了 ,0.285擴(kuò)大(或縮小到原來的),,,左,兩位,,,0.00285,,火眼金晴！,0.56×1000=560 ( ),4.7÷10=0.047 ( ),0.85

6、5;100=850 ( ),3.69的小數(shù)點(diǎn)向右移動兩位,原數(shù)擴(kuò)大20倍. ( ),去掉1.04的小數(shù)點(diǎn),這個數(shù)就擴(kuò)大100倍. ( ),√,×,×,×,√,,,,,,,,,,0.618×10,6.18,36.9÷10,,3.14×100,,0.1×1000,1.414×10,9.87&

7、#247;10,1.4×100,0.01÷1000,3.69,100,314,14.14,0.987,0.00001,140,過河,,23800÷1000元,512÷100元,0.24×10元,,0.0098×1000元,15.8÷10元,0.068×100元,,56.5÷10元,0.078×1000元,水果店,,哪兩種水果最貴呢?,√,