272百分?jǐn)?shù)與分?jǐn)?shù)的互化.ppt

1、,百分?jǐn)?shù)與分?jǐn)?shù)的互化,0.25=,把下面的小數(shù)化成分?jǐn)?shù),先把小數(shù)化成分母是10、100、1000的分?jǐn)?shù)，能約分的要約成最簡(jiǎn)分?jǐn)?shù)。,0.7=,0.367=,小數(shù),把下面的分?jǐn)?shù)化成小數(shù),除不盡的保留三位小數(shù)。,=0.75,=0.63,0.333,用分子除以分母.,分?jǐn)?shù),把下面各小數(shù)化成百分?jǐn)?shù) ,0.36=,1.7=,36%,170%,0.137=,小數(shù) 百分?jǐn)?shù),把小數(shù)點(diǎn)向右移動(dòng)兩位，同時(shí)在后面添上百分號(hào).,13.7%,把下面各百分?jǐn)?shù)化成小數(shù),95%,0.8%,13.6%,135%,=0.95,=0.008,=0.136,=1.35,把百分?jǐn)?shù)化成小數(shù)，只要把百分號(hào)去掉，同時(shí)把小數(shù)點(diǎn)向左移動(dòng)兩位。,2

2、0%,80%,百分?jǐn)?shù),先把百分?jǐn)?shù)改寫(xiě)成分母是100的分?jǐn)?shù),能約分的要約成最簡(jiǎn)分?jǐn)?shù).,百分?jǐn)?shù)與分?jǐn)?shù)的互化,做一做,1、填空。,3.5,35,120,百分?jǐn)?shù)與分?jǐn)?shù)的互化,把分?jǐn)?shù)化成百分?jǐn)?shù)，通常先把分?jǐn)?shù)化成小數(shù)（除不盡時(shí)，通常保留三位小數(shù)），再把小數(shù)化成百分?jǐn)?shù)。,分?jǐn)?shù),百分?jǐn)?shù)與分?jǐn)?shù)的互化,百分?jǐn)?shù)與分?jǐn)?shù)的互化,做一做,把下列的分?jǐn)?shù)化成百分?jǐn)?shù).,1,4,百分?jǐn)?shù)與分?jǐn)?shù)的互化,百分?jǐn)?shù),先把百分?jǐn)?shù)改寫(xiě)成分母是100的分?jǐn)?shù),能約分的要約成最簡(jiǎn)分?jǐn)?shù).,把分?jǐn)?shù)化成百分?jǐn)?shù)，通常先把分?jǐn)?shù)化成小數(shù)（除不盡時(shí)，通常保留三位小數(shù)），再把小數(shù)化成百分?jǐn)?shù)。,分?jǐn)?shù),百分?jǐn)?shù)與分?jǐn)?shù)的互化,1、判斷題,5656% ( ) =0.4% ( ) 1=100% ( ) 9%= ( ) 0.7%=70 ( ) 315%=3.15( ),填表,0.3,150%,33.3%,0.333,0.6,0.5%,0.005,百分?jǐn)?shù)與分?jǐn)?shù)的互化,2、,60%,0.375,37.5%,3、按由小到大的順序 排列下列各數(shù)。,0.85,0.58,85.1%,百分?jǐn)?shù)與分?jǐn)?shù)的互化,80,2,12.5,100,50,百分?jǐn)?shù)與分?jǐn)?shù)的互化,開(kāi)放題,制 作