《2025年口算训练六年级数学上册人教版双色升级版》

$\frac {1}{4}= $( )%
$\frac {3}{5}= $( )%
$\frac {1}{8}= $( )%
$1\frac {3}{20}= $( )%
$\frac {6}{25}= $( )%
$1\frac {4}{5}= $( )%
$\frac {1}{2}= $( )%
$\frac {3}{8}= $( )%
$\frac {9}{10}= $( )%
$2\frac {1}{2}= $( )%
$\frac {7}{8}= $( )%
$\frac {5}{8}= $( )%
$\frac {4}{25}= $( )%

答案： 解析：本题考查分数与百分数的转化，将分数的分子分母同时乘以一个数，使分母变为100，即可得到对应的百分数，如果不能直接变为分母是100的分数，则先转化为小数，再转化为百分数。
答案：
$\frac {1}{4}= \frac{25}{100} =25\%$；
$\frac {3}{5}= \frac{60}{100} =60\%$；
$\frac {1}{8}= \frac{0.125}{1} = 0.125=12.5\%$；
$1\frac {3}{20}= \frac{23}{20}= \frac{115}{100} =115\%$；
$\frac {6}{25}= \frac{24}{100} =24\%$；
$1\frac {4}{5}= \frac{9}{5}= \frac{180}{100} =180\%$；
$\frac {1}{2}= \frac{50}{100} =50\%$；
$\frac {3}{8}= \frac{0.375}{1} = 0.375=37.5\%$；
$\frac {9}{10}= \frac{90}{100} =90\%$；
$2\frac {1}{2}= \frac{5}{2}= \frac{250}{100} =250\%$；
$\frac {7}{8}= \frac{0.875}{1} = 0.875=87.5\%$；
$\frac {5}{8}= \frac{0.625}{1} = 0.625=62.5\%$；
$\frac {4}{25}= \frac{16}{100} =16\%$。

$55×20\% = $
$75×40\% = $
$36×20\% = $
$35×80\% = $
$25×80\% = $
$30×85\% = $
$40×40\% = $
$20×160\% = $
$80×25\% = $
$9×150\% = $
$65×20\% = $
$90×80\% = $
$100×22\% = $
$77×20\% = $
$56×20\% = $
$65×10\% = $
$8×120\% = $
$120×5\% = $
$45×15\% = $
$72×10\% = $
$25×80\% = $

答案： 解析：这些题目都是百分数的乘法口算题。我们需要将每个数乘以对应的百分数来得到结果。
答案：
$55×20\% = 11$
$75×40\% = 30$
$36×20\% = 7.2$
$35×80\% = 28$
$25×80\% = 20$
$30×85\% = 25.5$
$40×40\% = 16$
$20×160\% = 32$
$80×25\% = 20$
$9×150\% = 13.5$
$65×20\% = 13$
$90×80\% = 72$
$100×22\% = 22$
$77×20\% = 15.4$
$56×20\% = 11.2$
$65×10\% = 6.5$
$8×120\% = 9.6$
$120×5\% = 6$
$45×15\% = 6.75$
$72×10\% = 7.2$
$25×80\% = 20$

$35÷7\% =$500
$27÷54\% =$50
$60÷20\% =$300
$70÷10\% =$700
$70÷35\% =$200
$80÷40\% =$200
$72÷12\% =$600
$40÷100\% =$40
$120÷20\% =$600
$34÷50\% =$68
$80×40\% =$32
$90÷60\% =$150
$840÷120\% =$700
$400÷80\% =$500
$400×80\% =$320
$350÷70\% =$500
$350×7\% =$24.5
$1000×65\% =$650
$48÷15\% =$320
$65÷130\% =$50
$75÷25\% =$300

答案： 解析：
这些问题主要考察百分数的除法和乘法运算。为了解答这些问题，我们需要将百分数转换为小数，然后进行除法或乘法运算。
答案：
1. $35 ÷ 7\% = 35 ÷ 0.07 = 500$
2. $27 ÷ 54\% = 27 ÷ 0.54 = 50$
3. $60 ÷ 20\% = 60 ÷ 0.2 = 300$
4. $70 ÷ 10\% = 70 ÷ 0.1 = 700$
5. $70 ÷ 35\% = 70 ÷ 0.35 = 200$
6. $80 ÷ 40\% = 80 ÷ 0.4 = 200$
7. $72 ÷ 12\% = 72 ÷ 0.12 = 600$
8. $40 ÷ 100\% = 40 ÷ 1 = 40$
9. $120 ÷ 20\% = 120 ÷ 0.2 = 600$
10. $34 ÷ 50\% = 34 ÷ 0.5 = 68$
11. $80 × 40\% = 80 × 0.4 = 32$
12. $90 ÷ 60\% = 90 ÷ 0.6 = 150$
13. $840 ÷ 120\% = 840 ÷ 1.2 = 700$
14. $400 ÷ 80\% = 400 ÷ 0.8 = 500$
15. $400 × 80\% = 400 × 0.8 = 320$
16. $350 ÷ 70\% = 350 ÷ 0.7 = 500$
17. $350 × 7\% = 350 × 0.07 = 24.5$
18. $1000 × 65\% = 1000 × 0.65 = 650$
19. $48 ÷ 15\% = 48 ÷ 0.15 = 320$
20. $65 ÷ 130\% = 65 ÷ 1.3 = 50$
21. $75 ÷ 25\% = 75 ÷ 0.25 = 300$