青島版數(shù)學六上第七單元《百分數(shù)和分數(shù)、小數(shù)的互化》ppt課件1.ppt

百分數(shù)和小數(shù)、分數(shù)的互化,回顧反思,自主練習,合作探索,情境導入,一、情境導入,13% 1.2,你能把下面三個數(shù)，按從小到大的順序排起來嗎？,如何進行百分數(shù)、小數(shù)、分數(shù)的互化呢？,把分數(shù)和小數(shù)都化成百分數(shù)，再比較大小，或者把百分數(shù)和分數(shù)都化成小數(shù)，再,=,=,.,.,0.13 1.2,二、合作探索,你能把下面的數(shù)化成百分數(shù)嗎？,0.13,小數(shù)點向右移動兩位，添上%,1.2,小數(shù),百分數(shù),= 13%,= 120%,13,0.13,.,.,小數(shù)點向右移動兩位,擴大100倍,%,1.2,120,.,.,擴大100倍,小數(shù)點向右移動兩位,%,添上%，縮小到原來 的 ，大小不變,添上%，縮小到原來 的 ，大小不變,二、合作探索,你能把下面的數(shù)化成百分數(shù)嗎？,=75%,=,=0.75,0.833,化成小數(shù)（或分母是100的分數(shù)）,0.13 1.2,分數(shù),百分數(shù),=0.75,=83.3%,說說你的算法吧！,試一試,把下面各數(shù)化成百分數(shù),=37.5,0.571,=125,0.142 2.1 1,14,2,1,1 =,2.1 =,0.375,=,=57.1,=1.25,%,%,%,0.142 =,0,0,.,.,%,.,.,1,0,%,%,0.,.,.,2,二、合作探索,你能把下面的百分數(shù)化成分數(shù)嗎？,19% 25%,19%=,25%=,=,百分數(shù),分數(shù),改寫成分母是100的分數(shù)，再約分,15% =,說說你的算法吧！,把下面的百分數(shù)化成分數(shù)。,試一試,15% 60% 0.6% 150%,60% =,0.6% =,150% =,=,=,=,=,=,你能把下面的百分數(shù)化成小數(shù)嗎？,二、合作探索,3% 0.7% 123%,3% =,去掉%,小數(shù)點向左移動兩位,百分數(shù),小數(shù),0.7% =,123% =,3100 =,123100 =,0.7100 =,0.03,1.23,0.007,把下面的百分數(shù)化成小數(shù)。,你是怎樣想的？,試一試,0.28,0.8,0.009,1.2,28% 80% 0.9% 120%,80% =,28% =,0.9% =,120% =,三、自主練習,1.填表。,50%,0.3,30%,0.8,0.25,25%,350%,1.125,112.5%,0.5,3.5,80%,三、自主練習,2.把下面各數(shù)化成百分數(shù)。,0.07 0.142 2.1 1,0.07=,0.14=,2.1=,14%,7%,210%,=0.375,=37.5%,=0.1,=10%,=125%,571,=57.1%,=1.25,1 =,100%,三、自主練習,3.把下面的百分數(shù)化成分數(shù)。,54%=,66%=,0.8%=,1.5%=,54% 66% 0.08% 1.5%,三、自主練習,4.把下面的百分數(shù)化成小數(shù)。,150% =,28%=,0.6% =,1.8%=,1.5,0.28,0.006,0.018,150% 28% 0.6% 1.8%,三、自主練習,5.按照從大到小的順序排列下面各數(shù)。,（2） 0.13 127%,（1）75% 0.6 40%,75%,40%,0.6,0.13,127%,三、自主練習,6. 火眼金睛辨對錯。,（2）一杯糖水含糖率是20%，喝了一半后，剩下糖水的含糖率是10%。 （ ）,（1）六年級一班50的同學會游泳，表示會游泳的人數(shù)占全班人數(shù)的50。 （ ）,（3）李強已經(jīng)看了一本書的53，還剩47沒有看。 （ ）,三、自主練習,7.填一填。,=（ ）（ ）=（ ）=（ ）%,7,8,0.875,87.5,45,100,45,100,45,四、回顧反思,