《青島版數(shù)學(xué)六上第七單元《百分?jǐn)?shù)和分?jǐn)?shù)、小數(shù)的互化》ppt課件1.ppt》由會(huì)員分享，可在線閱讀，更多相關(guān)《青島版數(shù)學(xué)六上第七單元《百分?jǐn)?shù)和分?jǐn)?shù)、小數(shù)的互化》ppt課件1.ppt（17頁(yè)珍藏版）》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。

1、百分?jǐn)?shù)和小數(shù)、分?jǐn)?shù)的互化,回顧反思,自主練習(xí),合作探索,情境導(dǎo)入,一、情境導(dǎo)入,13% 1.2,你能把下面三個(gè)數(shù)，按從小到大的順序排起來(lái)嗎？,如何進(jìn)行百分?jǐn)?shù)、小數(shù)、分?jǐn)?shù)的互化呢？,把分?jǐn)?shù)和小數(shù)都化成百分?jǐn)?shù)，再比較大小，或者把百分?jǐn)?shù)和分?jǐn)?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?jǐn)?shù)嗎？,0.13,,小數(shù)點(diǎn)向右移動(dòng)兩位，添上%,1.2,小數(shù),百分?jǐn)?shù),,,= 13%,= 120%,13,0.13,.,.,,小數(shù)點(diǎn)向右移動(dòng)兩位,擴(kuò)大100倍,%,1.2,120,.,.,,擴(kuò)大100倍,小數(shù)點(diǎn)向右移動(dòng)兩位,%,,添上%，縮小到原來(lái) 的 ，大小不變,添上%，縮

2、小到原來(lái) 的 ，大小不變,,二、合作探索,你能把下面的數(shù)化成百分?jǐn)?shù)嗎？,=75%,=,=0.75,0.833,化成小數(shù)（或分母是100的分?jǐn)?shù)）,0.13 1.2,分?jǐn)?shù),百分?jǐn)?shù),,=0.75,=83.3%,,說(shuō)說(shuō)你的算法吧！,試一試,把下面各數(shù)化成百分?jǐn)?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?jǐn)?shù)化成分?jǐn)?shù)嗎？,19% 25%,19%=,25%=,=,,,,百分?jǐn)?shù),分?jǐn)?shù),改寫(xiě)成分母是1

3、00的分?jǐn)?shù)，再約分,,,15% =,說(shuō)說(shuō)你的算法吧！,把下面的百分?jǐn)?shù)化成分?jǐn)?shù)。,試一試,15% 60% 0.6% 150%,60% =,0.6% =,150% =,=,=,=,=,=,你能把下面的百分?jǐn)?shù)化成小數(shù)嗎？,二、合作探索,3% 0.7% 123%,3% =,,,去掉%,小數(shù)點(diǎn)向左移動(dòng)兩位,百分?jǐn)?shù),小數(shù),,0.7% =,123% =,3100 =,123100 =,0.7100 =,,0.03,1.23,0.007,把下面的百分?jǐn)?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

4、% =,三、自主練習(xí),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(xí),2.把下面各數(shù)化成百分?jǐn)?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(xí),3.把下面的百分?jǐn)?shù)化成分?jǐn)?shù)。,,,,54%=,66%=,0.8%=,1.5%=,54% 66% 0.08% 1.5%,三、自主練習(xí),4.把下面的百分?jǐn)?shù)化成小數(shù)。,,,,

5、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(xí),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(xí),,,,6. 火眼金睛辨對(duì)錯(cuò)。,（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(jí)一班50的同學(xué)會(huì)游泳，表示會(huì)游泳的人數(shù)占全班人數(shù)的50。 （ ）,（3）李強(qiáng)已經(jīng)看了一本書(shū)的53，還剩47沒(méi)有看。 （ ）,,,,三、自主練習(xí),7.填一填。,,,,,=（ ）（ ）=（ ）=（ ）%,7,8,0.875,87.5,45,100,45,100,45,四、回顧反思,