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【321058】【精品】第六章《百分数(一)》六年级数学上册提优精选题汇编1 人教版

时间:2025-01-08 19:20:52 作者: 字数:8523字
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【精品】第六章《百分数(一)》六年级数学上册提优精选题汇编1 人教版

一.选择题(共8小题)

1.下面四幅图中,(  )的阴影部分占整幅图的12.5%

A <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> B <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

C <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> D <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

2.把7.9%的百分号去掉,这个数与原数相比,(  )

A.大小不变 B.扩大到原来的100

C.缩小到原来的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> D.无法确定

3.在80后面添上百分号,这个数就(  )

A.扩大到原来的100 B.缩小到原来的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

C.大小不变

4.只去掉12.5%的百分号,这个数(  )

A.不变 B.缩小为原来的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

C.扩大为原来的100

5.下面各数能改写成百分数的是(  )

A.绳子长为0.25 B.大米重0.2

C.大米质量是面粉的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

6.把1.6化成最简分数,正确的是(  )

A <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> B <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> C <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

7.下面各数接近30%的数是(  )

A35.5% B0.35 C <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> D <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

8.把0.1%化成小数,正确的是(  )

A0.001 B0.1 C0.01

二.填空题(共10小题)

945%的计数单位是   ,再加上   个这样的计数单位就是1

10 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    %   小数

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    %   小数

112018年前十个月,城固县实施招商引资项目57个,到位资金74.34亿元,占年度任务的102%.将102%改写成小数是   ,改写成分数是   

12.把下列分数化成百分数,把百分数化成分数.

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    

124%   

3.2%   

13 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

1)百分数               

2)分数               

3)小数               

14.读出或写出下面的百分数.

94%读作   ;百分之一百零五写作   35.6%读作   ;百分之零点七写作   

15.百分数,也叫      .九五折改写成百分数是   ,它含有   1%

16.因为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 20%,所以 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 吨=20%吨.   ;如果a× <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> b,那么ab   

17.今年小麦产量比去年增产二成三,表示今年比去年增产   %,也就是今年的产量相当于去年的   %

18 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    %0.6 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>    折=   成.

三.判断题(共5小题)

19.一根铁丝长1米,用去 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 后,还剩下50%米.   (判断对错)

20.一种树苗的成活率是101%   (判断对错)

21.一根绳子长 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 米,也就是长40%米.   (判断对错)

22 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.16716.7%   .(判断对错)

23.把小数化成百分数,只要把小数点去掉,添上百分号即可.   (判断对错)

四.操作题(共1小题)

24.在图中涂阴影,使阴影部分面积占整形面积的37.5%

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

五.解答题(共6小题)

25.估计每幅图的阴影占整幅图的百分之几,与对应的百分数连一连.

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

26.在横线里填上合适的小数或分数:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

27.分别用百分数、分数和小数表示直线上的各点.

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

28.仔细观察,多动脑筋,把图中阴影部分用不同的方法填一填.

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

用百分数表示   

用分数表示   

用小数表示   

29.六(1)班体育达标的人数占全班人数的68%,六(2)班体育达标的人数占全班人数的70%.张华说:“六(1)班达标的人数一定比六(2)班达标的人数少.”他说得对吗?为什么?

30.厂计划本月用电100度,实际用了80度电,实际比计划节约了百分之几?

参考答案与试题解析

一.选择题(共8小题)

1.解:12.5% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

A:不是平均分成8份,阴影部分不能用分数表示;

B:是平均分成了9份,1份就是 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,不是12.5%

C:是把圆平均分成了8份,其中的1份就是 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,也就是12.5%

D:是把长方形平均分成了4份,其中的1份就是 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,不是12.5%

故选:C

2.解:7.9%0.079,由0.0797.9,扩大到原来的100倍;

故选:B

3.解:在80后面添上百分号,这个数就缩小100倍也就是缩小到原来的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故选:B

4.解:把12.5%的百分号去掉,变成了12.5

12.5÷12.5%100,即扩大到原来的100倍.

故选:C

5.解:百分数不能带单位名称,所以选项AB不能改写成百分数;

由于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 可以表示成60%,所以应选C

故选:C

6.解:1.6 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故选:B

7.解:30%0.3

A35.5%0.3550.3550.30.055

B0.350.30.05

C <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.3750.3750.30.075

D <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.3330.3330.30.033

0.0330.050.0550.075

因此, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 最接近30%

故选:D

8.解:0.1%0.001

故选:A

二.填空题(共10小题)

9.解:45%的分数单位是1%

145%÷1%

55%÷1%

55

即再加上55个这样的分数单位就是1

故答案为:1%55

10.解: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.62562.5%

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.1212%

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 62.5%0.625

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 12%0.12

故答案为:62.50.625120.12

11.解:102%1.02

102% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故答案为:1.02 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

12.解:(1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 17.5%

2 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 275%

3124% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

43.2% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故答案为:17.5%275% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

13.解:用百分数、分数、小数表示数轴上各点如下:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故答案为:12%29%50%68%91% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> (或 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ), <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> (或 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ), <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.120.290.50.680.91

14.解:94%读作 百分之九十四;百分之一百零五写作 105%35.6%读作 百分之三十五点六;百分之零点七写作 0.7%

故答案为:百分之九十四;105%;百分之三十五点六;0.7%

15.解:百分数,也叫百分率或百分比.九五折改写成百分数是95%,它含有951%

故答案为:百分率,百分比,95%95

16.解:百分数只是一个数不能带任何单位名称,因为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 20%,所以 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 吨=20%吨.这种说法是错误的.

一个数乘分数表示求这个数的几分之几是多少,如果a× <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> b,那么ab是错误的;ab

故答案为:错误错误

17.解:今年小麦产量比去年增产二成三,表示今年比去年增产23%,也就是今年的产量相当于去年的123%

故答案为:23123

18.解: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 60%0.6 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> =六折=六成.

故答案为:609,六,六.

三.判断题(共5小题)

19.解:根据百分数的意义可知,百分数不能表示某一具体数量,所以“一根铁丝长1米,用去 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,还剩下50%米“的说法是错误的.

故答案为:×

20.解:一种树苗的成活率是101%,说法错误,因为一种树苗的成活率最多是100%,说法错误;

故答案为:×

21.解:因为百分数表示一个数是另一个数的百分之几,是不能带单位的;

所以一根绳子长 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 米,也就是长40%米的说法是错误的;

故答案为:×

22.解: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.16716.7%

故答案为:√.

23.解:把小数化成百分数,只要把小数向右移动两位,添上百分号即可

原题说法错误.

故答案为:×

四.操作题(共1小题)

24.解:16×37.5%6

涂色如下:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

五.解答题(共6小题)

25.解:33% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,把整体“1平均分成3份,其中的1份;

50% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,把整体“1平均分成2份,其中的1份;

75% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,把整体“1平均分成4份,其中的3份;

12.5% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,把整体“1平均分成8份,其中的1份;

25% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> ,把整体“1平均分成4份,其中的1份;

由此可得:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

26.解:见下图:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

故答案为: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.42.9

27.解:分别用百分数、分数和小数表示直线上的各点:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

28.解:如图:

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

用百分数表示40%

用分数表示 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a>

用小数表示0.4

故答案为:40% <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/199/" title="汇编" class="c1" target="_blank">汇编</a> <a href="/tags/425/" title="百分数" class="c1" target="_blank">百分数</a> 0.4

29.解:六(1)班体育达标的人数占全班人数的68%,是把六(1)班的总人数看作单位“1

六(2)班体育达标的人数占全班人数的70%,是把六(2)班的总人数看作单位“1

因为本题中前后两个单位“1不同,所以无法比较;

故答案为:×

30.解:(10080÷100

20÷100

20%

答:实际比计划节约了20%

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