百分数的认识PPT课件5[1].ppt
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1、分数段百分比人数60分以下 15.7%8人60分80分 31.4%16人81分-100分 52.9%27人府谷一小五(2)班期中数学成绩汇总表 15.7%读作:读作: 31.4%读作:读作: 52.9%读作:读作:百分之十五点七百分之十五点七百分之三十点四百分之三十点四百分之五十二点九百分之五十二点九你在生活中见过百分数吗? 据新华社报道,地球表面陆地面积仅占据新华社报道,地球表面陆地面积仅占29%29%,全球沙漠,全球沙漠面积占地球陆地面积的近面积占地球陆地面积的近25%25%,而且沙漠化面积还在增加。,而且沙漠化面积还在增加。陆地除了沙漠、冰川等土地外,只有约陆地除了沙漠、冰川等土地外,只
2、有约30%30%可以耕种。另据可以耕种。另据统计,目前世界上约有统计,目前世界上约有40%40%的人口严重缺水,而据我国资料的人口严重缺水,而据我国资料显示,全国湖泊约有显示,全国湖泊约有75%75%的水域已受到显著污染。自然环境的水域已受到显著污染。自然环境的恶化也严重威胁到地球上的野生物种,如今全球的恶化也严重威胁到地球上的野生物种,如今全球12%12%的鸟的鸟类和类和25%25%的哺乳动物濒临灭绝,而过渡捕捞已导致的哺乳动物濒临灭绝,而过渡捕捞已导致30%30%的的鱼类资源枯竭。鱼类资源枯竭。府谷一小足球比赛中,五(2)班获得了一次罚点球的机会,他们准备派下列三名队员中的一名去罚点球.白
3、展鹏:曾经罚点球罚中18次.齐浩:曾经罚点球罚中7次.杜强:曾经罚点球罚中21次.你认为应该选派哪名队员?你认为应该选派哪名队员?白展鹏:曾经罚点球20次,罚中18次.齐浩:曾经罚点球10次,罚中7次.杜强:曾经罚点球25次,罚中21次. 710 2125 1820中球的次数是总次数中球的次数是总次数的几分之几(中球率)的几分之几(中球率)这个时候大家能不能看出这个时候大家能不能看出谁的中球率高?谁的中球率高?如果我们把上面的三个分数化成分母为100的分数就很容易看出了! 710 2125 1820=7101010= 70100= 214254= 84100= 185205= 90100品种品
4、种实验种子数实验种子数(粒)(粒)发芽种子数发芽种子数(粒)(粒)一号一号二号二号三号三号科技小组做黄豆种子的发芽实验,科技小组做黄豆种子的发芽实验,天后种子的发芽情况如下表天后种子的发芽情况如下表你认为哪个品种的发芽情况最好?与同学进行交流!化成分母为100的分数就很容易比较了!品种品种实验种子实验种子数数(粒)(粒)发芽种子发芽种子数数(粒)(粒)一号一号二号二号三号三号一号种子发芽率二号种子发芽率三号种子发芽率= 520 25100 22100= 28100= 2006年,全国各省、自治区、直辖市,上报的各类安全事故中,事故灾难占59%;社会安全事故占31%;自然灾害占10%,其中,溺水
5、占31.25%,交通事故占19.64%,斗殴占10.71%,校园伤害占14.29%,中毒占2.68%,学生踩踏事件占1.79%,自杀占5.36%,房屋倒塌占0.89%,自然灾害占9.82%,其他意外事故占3.57%。 2006年,全国各省、自治区、直辖市,上报的各类安全事故中,事故灾难占 ;社会安全事故占 ;自然灾害占 ,其中,溺水占 ,交通事故占 ,斗殴占 ,校园伤害占 ,中毒占 ,学生踩踏事件占 ,自杀占 ,房屋倒塌占 ,自然灾害占 ,其他意外事故占 。100591011000035710031250049116525006710000142910000107150004911000089
6、12506710000179从下面10名篮球爱好者中挑选出3名参加篮球比赛,假如你是教练,你会选谁去参加比赛?队员 投中个数 投篮总个数 命 中 率1号36502号16253号8104号7105号586号13207号20268号21289号101410号 37522518548513107525161072013435237182001310418200140001820011375182001456018200150001820011648182001274018200118001820013550182001295071.2%71.4%72%75%76.9%65%62.5%70%80%64
7、%18200131041820011648182001456018200131041820011648182001274018200145601820013104182001164818200113751820012740182001456018200131041820011648182001180018200113751820012740182001456018200131041820011648182001400018200118001820011375182001274018200145601820013104182001164818200135501820014000182001180
8、01820011375182001274018200145601820013104182001164818200150001820014000182001180018200113751820012740182001456018200131041820011648182001400018200118001820011375182001274018200145601820013104182001164872%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
9、%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%1820013104182001164818200145601820013104182001164818200127401820014560182001310418200116481820011375182001274018200145601820013104182001164818200118001820011375182001274018200145601820013104182001164818200140001
10、820011800182001137518200127401820014560182001310418200116481820014000182001180018200113751820012740182001456018200116481820014000182001180018200113751820012740182001456018200116481820011648182001456018200116481820012740182001456018200116481820011375182001274018200145601820011648182001180018200113751
11、820012740182001456018200116481820014000182001180018200113751820012740182001456018200116481820011800182001137518200127401820014560182001295018200150001820013550182001400018200118001820011375182001274018200145601820013104182001164872%64%72%64%80%72%64%70%80%72%64%62.5%70%80%72%64%65%62.5%70%80%72%64%7
12、6.9%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%71.4%75%76.9%65%62.5%70%80%队员 投中个数 投篮总个数 命 中 率1号36502号16253号8104号7105号586号13207号20268号21289号101410号 3752
13、2518548513107525161072013435237182001310418200140001820011375182001456018200150001820011648182001274018200118001820013550182001295071.2%71.4%72%75%76.9%65%62.5%70%80%64%18200131041820011648182001456018200131041820011648182001274018200145601820013104182001164818200113751820012740182001456018200131041
14、820011648182001180018200113751820012740182001456018200131041820011648182001400018200118001820011375182001274018200145601820013104182001164818200135501820014000182001180018200113751820012740182001456018200131041820011648182001500018200140001820011800182001137518200127401820014560182001310418200116481
15、82001400018200118001820011375182001274018200145601820013104182001164872%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%62.5%70%80%72%64%1820013104182001164818200145601820013104182
16、001164818200127401820014560182001310418200116481820011375182001274018200145601820013104182001164818200118001820011375182001274018200145601820013104182001164818200140001820011800182001137518200127401820014560182001310418200116481820014000182001180018200113751820012740182001456018200116481820014000182
17、001180018200113751820012740182001456018200116481820011648182001456018200116481820012740182001456018200116481820011375182001274018200145601820011648182001180018200113751820012740182001456018200116481820014000182001180018200113751820012740182001456018200116481820011800182001137518200127401820014560182
18、001295018200150001820013550182001400018200118001820011375182001274018200145601820013104182001164872%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%
19、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%队员 投中个数 投篮总个数 命 中 率1号36502号16253号8104号7105号586号13207号20268号21289号101410号 3752251854851310752516107201343523718200131041820014000182001137518200145601820015000182001164818200127401820011800182001355
20、0182001295071.2%71.4%72%75%76.9%65%62.5%70%80%64%18200131041820011648182001456018200131041820011648182001274018200145601820013104182001164818200113751820012740182001456018200131041820011648182001180018200113751820012740182001456018200131041820011648182001400018200118001820011375182001274018200145601
21、82001310418200116481820013550182001400018200118001820011375182001274018200145601820013104182001164818200150001820014000182001180018200113751820012740182001456018200131041820011648182001400018200118001820011375182001274018200145601820013104182001164872%64%80%72%64%70%80%72%64%62.5%70%80%72%64%65%62.5
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