滬教版四年下《小數(shù)的性質》課件之三.ppt
小數(shù)的性質,滬教版四年級數(shù)學下冊,學習目標,本節(jié)課我們主要來學習小數(shù)的性質,同學們結合實際問題理解并掌握小數(shù)的性質,知道小數(shù)末尾的0在實際問題中表示的含義。能夠應用小數(shù)的性質解決相關的實際問題。,110100,=,=,角,元,分,米,分米,厘米,分米,厘米,毫米,100毫米=米,寫成小數(shù)是()米,100,0.100,10厘米=米,寫成小數(shù)是()米,1分米=米,寫成小數(shù)是()米,0.10,1,0.1,10,cm,1分米10厘米=100毫米,因為:,0.1米0.10米0.100米,所以:,=,=,小數(shù)的末尾添上O,小數(shù)的末尾去掉O,在小數(shù)的末尾添上O(或去掉O),小數(shù)的大小不變。,觀察:什么變了?什么沒變?你有什么發(fā)現(xiàn)?,=,下面的數(shù)哪些“0”可以去掉?哪些“0”不能去掉?3.900.300102.0201.80060.065.7805000.0040,1.把0.70和105.0900化簡0.70=()105.0900=(),2.不改變數(shù)的大小,把0.2和4.08改寫成小數(shù)部分是三位的小數(shù)0.2=()4.08=(),0.7,105.09,0.200,4.080,下面的數(shù)如果末尾添“0”,哪些數(shù)的大小不變,哪些數(shù)的大小有變化?,3.4180.067003.0908104.0315010.0142.00,判斷:1.0.020.2(),3.80元可以寫成80.00元。(),2.在小數(shù)點的后面添上“0”或者去掉“0”,小數(shù)的大小不變。(),把相等的數(shù)用線連起來,72.060,2.70,301.01,0.0050,4.40,0.005,40400,2.7,301.010,72.60,把下列分數(shù)改寫成小數(shù)。,0.1,0.30,0.800,0.340,辨別:哪些“0”可以去掉,0.08,0,0.603,00,500,.0000000,60,小數(shù)性質:小數(shù)部分的末尾添上“0”或者去掉“0”,小數(shù)的大小不變。,10.000=,105.0900=,0.70=,0.7,105.09,10,利用小數(shù)性質化簡。,0,00,.000,不改變數(shù)的大小,把下面各數(shù)改寫成三位小數(shù)。0.2=4.08=3=,0.200,4.080,3.000,