1、,百分?jǐn)?shù)的認(rèn)識,表白寺實(shí)驗(yàn)小學(xué)六年級（3）班期中數(shù)學(xué)成績匯總,23.2讀作：,百分之二十三點(diǎn)二,28.3讀作：,百分之二十八點(diǎn)三,48.2讀作：,百分之四十八點(diǎn)二,你在生活中見過百分?jǐn)?shù)嗎？,據(jù)新華社報(bào)道，地球表面陸地面積僅占29%，全球沙漠面積占地球陸地面積的近25%，而且沙漠化面積還在增加。陸地除了沙漠、冰川等土地外，只有約30%可以耕種。另據(jù)統(tǒng)計(jì)，目前世界上約有40%的人口嚴(yán)重缺水，而據(jù)我國資料顯示，全國湖泊約有75%的水域已受到顯著污染。自然環(huán)境的惡化也嚴(yán)重威脅到地球上的野生物種，如今全球12%的鳥類和25%的哺乳動(dòng)物瀕臨滅絕，而過渡捕撈已導(dǎo)致30%的魚類資源枯竭。,表白寺實(shí)小足球比賽中

2、,六（3）班獲得了一次罰點(diǎn)球的機(jī)會(huì),他們準(zhǔn)備派下列三名隊(duì)員中的一名去罰點(diǎn)球.,趙文建：曾經(jīng)罰點(diǎn)球罰中18次.,王兵：曾經(jīng)罰點(diǎn)球罰中7次.,朱文斌：曾經(jīng)罰點(diǎn)球罰中21次.,你認(rèn)為應(yīng)該選派哪名隊(duì)員?,你認(rèn)為應(yīng)該選派哪名隊(duì)員?,趙文建：曾經(jīng)罰點(diǎn)球20次，罰中18次,王兵：曾經(jīng)罰點(diǎn)球10次,罰中7次.,朱文斌：曾經(jīng)罰點(diǎn)球25次,罰中21次.,中球的次數(shù)是總次數(shù)的幾分之幾（中球率）,這個(gè)時(shí)候大家能不能看出誰的中球率高？,如果我們把上面的三個(gè)分?jǐn)?shù)化成分母為100的分?jǐn)?shù)就很容易看出了！,=,=,=,=,=,=,科技小組做黃豆種子的發(fā)芽實(shí)驗(yàn)，天后種子的發(fā)芽情況如下表,你認(rèn)為哪個(gè)品種的發(fā)芽情況最好？與同學(xué)進(jìn)行交

3、流！,化成分母為100的分?jǐn)?shù)就很容易比較了！,一號種子發(fā)芽率,二號種子發(fā)芽率,三號種子發(fā)芽率,=,=,=,2006年，全國各省、自治區(qū)、直轄市，上報(bào)的各類安全事故中，事故災(zāi)難占59%；社會(huì)安全事故占31%；自然災(zāi)害占10%，其中，溺水占31.25%，交通事故占19.64%，斗毆占10.71%,校園傷害占14.29%，中毒占2.68%，學(xué)生踩踏事件占1.79%，自殺占5.36%，房屋倒塌占0.89%，自然災(zāi)害占9.82%，其他意外事故占3.57%。,2006年，全國各省、自治區(qū)、直轄市，上報(bào)的各類安全事故中，事故災(zāi)難占 ；社會(huì)安全事故占 ；自然災(zāi)害占 ，其中，溺水占 ，交通事故占 ，斗毆占 ,校

4、園傷害占 ，中毒占 ，學(xué)生踩踏事件占 ，自殺占 ，房屋倒塌占 ，自然災(zāi)害占 ，其他意外事故占 。,從下面10名籃球愛好者中挑選出3名參加籃球比賽，假如你是教練，你會(huì)選誰去參加比賽？,71.2%,71.4%,72%,75%,76.9%,65%,62.5%,70%,80%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%

5、,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,80%,72%,6

6、4%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,71.4%,75%,76.9%,65%,62.5%,70%,80%,71.2%,71.4%,72%,75%,76.9%,65%,62.5%,70%,80%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,6

7、5%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,8

8、0%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,72%,75%,76.9%,65%,62.5%,70%,80%,64%,72%,6

9、4%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,6

10、4%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%

11、,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,72%,75%,76.9%,65%,62.5%,70%,80%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,75%,76.9%,65%

12、,62.5%,70%,80%,72%,64%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%

13、,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,72%,75%,76.9%,65%,62.5%,70%,80%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.

14、5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.2%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,8

15、0%,72%,64%,72%,64%,80%,72%,64%,70%,80%,72%,64%,62.5%,70%,80%,72%,64%,65%,62.5%,70%,80%,72%,64%,76.9%,65%,62.5%,70%,80%,72%,64%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,71.4%,75%,76.9%,65%,62.5%,70%,80%,72%,64%,百分?jǐn)?shù)的意義： 像22%、28%、90%、117.5%，這樣的數(shù)叫做百分?jǐn)?shù)，表示一個(gè)數(shù)是另一個(gè)數(shù)的百分之幾。百分?jǐn)?shù)也叫百分比、百分率。,下面的哪個(gè)分?jǐn)?shù)可以用百分?jǐn)?shù)表示？ 1.2006年亞運(yùn)會(huì)

16、中國的金牌數(shù)是金牌 總數(shù)的,2.一個(gè)蘋果重,3.我國人口占世界人口的,4.一張桌面的長是,米,千克,（）,（）,百分?jǐn)?shù)與分?jǐn)?shù)在意義上的區(qū)別：分?jǐn)?shù)既可以表示一個(gè)數(shù)是另一個(gè)數(shù)的幾分之幾，又可以表示一個(gè)具體的數(shù)量，而百分?jǐn)?shù)是表示一個(gè)數(shù)是另一個(gè)數(shù)的百分之幾，表示兩個(gè)數(shù)比較的結(jié)果，是一個(gè)比率，百分?jǐn)?shù)不能表示具體的數(shù)量，后面不帶單位名稱。,（2）分母是100的分?jǐn)?shù)就是百分?jǐn)?shù)。,（3）一根繩長75米。,（1）這批產(chǎn)品的合格率是98%。,判斷,涂色部分占“1”的百分之幾？,（ ）,（ ）,（ ）,（ ）,（ ）,（ ）,9,57,100,地球表面陸地面積僅占29%，沙漠面積占地球陸地面積的近25%，而且沙漠化面積還在增加。陸地面積中，只有約30%的土地可以耕種。 自然環(huán)境的惡化嚴(yán)重威脅著野生物種，如今全球12%的鳥類和25%的哺乳動(dòng)物瀕臨滅絕，而過度捕撈已導(dǎo)致30%的魚類資源枯竭。,選擇合適的百分?jǐn)?shù)填空 120% 100% 6% (1)由于全班同學(xué)的互相幫助，共同努力， 這次考試及格率達(dá)到（ ）% (2)轎