滬教版四年下《小數(shù)的性質(zhì)》課件之三.ppt
小數(shù)的性質(zhì),滬教版四年級(jí)數(shù)學(xué)下冊(cè),學(xué)習(xí)目標(biāo),本節(jié)課我們主要來(lái)學(xué)習(xí)小數(shù)的性質(zhì),同學(xué)們結(jié)合實(shí)際問(wèn)題理解并掌握小數(shù)的性質(zhì),知道小數(shù)末尾的0在實(shí)際問(wèn)題中表示的含義。能夠應(yīng)用小數(shù)的性質(zhì)解決相關(guān)的實(shí)際問(wèn)題。,110100,=,=,角,元,分,米,分米,厘米,分米,厘米,毫米,100毫米=米,寫(xiě)成小數(shù)是()米,100,0.100,10厘米=米,寫(xiě)成小數(shù)是()米,1分米=米,寫(xiě)成小數(shù)是()米,0.10,1,0.1,10,cm,1分米10厘米=100毫米,因?yàn)椋?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(méi)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(jiǎn)0.70=()105.0900=(),2.不改變數(shù)的大小,把0.2和4.08改寫(xiě)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(xiě)成80.00元。(),2.在小數(shù)點(diǎn)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(lái),72.060,2.70,301.01,0.0050,4.40,0.005,40400,2.7,301.010,72.60,把下列分?jǐn)?shù)改寫(xiě)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(zhì):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(zhì)化簡(jiǎn)。,0,00,.000,不改變數(shù)的大小,把下面各數(shù)改寫(xiě)成三位小數(shù)。0.2=4.08=3=,0.200,4.080,3.000,