一、口算。（建议用时6分钟）
0.3 + 50% =
5 - 25% =
2.4 - 80% =
$\frac{2}{5} ÷ \frac{1}{4} =$
40% ÷ $\frac{3}{5} =$
$\frac{3}{8} ÷ 6 =$
$\frac{2}{3} + \frac{1}{4} =$
4.8 × 20% =
300 × 15% =
90 × 70% =
25% × 6 =
10 ÷ $\frac{2}{3} =$
$\frac{1}{3} - \frac{1}{4} =$
$\frac{7}{8} ÷ \frac{1}{16} =$
$\frac{5}{7} × 21 =$
$\frac{2}{3} × \frac{1}{5} =$
2.5 × 30% =
6 × 15% =
22 × 40% =
$\frac{5}{8} × 16 =$
$\frac{3}{10} × \frac{2}{9} =$
$\frac{5}{6} ÷ \frac{1}{2} =$
$\frac{4}{5} × \frac{5}{12} =$
12 ÷ $\frac{3}{4} =$
$\frac{1}{2} × \frac{2}{5} =$
$\frac{5}{6} × 12 =$
$\frac{5}{9} ÷ 5 =$
80% × $\frac{1}{2} =$
18 × $\frac{2}{3} =$
$\frac{3}{8} ÷ \frac{4}{5} =$
$\frac{5}{8} - 50\% =$
$\frac{9}{5} ÷ \frac{2}{3} =$
0.77 + 33% =
9 ÷ $\frac{2}{9} =$
7 ÷ 14% =
0.99 × $\frac{10}{11} =$
75% × $\frac{3}{8} =$
30% ÷ $\frac{1}{3} =$
$\frac{8}{15} ÷ \frac{4}{15} =$
18% ÷ 9 =

1. 0.8
2. 4.75
3. 1.6
4. $\frac{8}{5}$
5. $\frac{2}{3}$
6. $\frac{1}{16}$
7. $\frac{11}{12}$
8. 0.96
9. 45
10. 63
11. 1.5
12. 15
13. $\frac{1}{12}$
14. 14
15. 15
16. $\frac{2}{15}$
17. 0.75
18. 0.9
19. 8.8
20. 10
21. $\frac{1}{15}$
22. $\frac{5}{3}$
23. $\frac{1}{3}$
24. 16
25. $\frac{1}{5}$
26. 10
27. $\frac{1}{9}$
28. 0.4
29. 12
30. $\frac{15}{32}$
31. $\frac{1}{8}$
32. $\frac{27}{10}$
33. 1.1
34. $\frac{81}{2}$
35. 50
36. 0.9
37. $\frac{9}{32}$
38. 0.9
39. 2
40. 0.02

二、将下面各数化成百分数。(除不尽的百分号前保留一位小数)(建议用时4分钟)
0.705=
0.53=
0.035=
42.5=
1.15=
0.77=
0.597=
0.015=
$\frac{13}{20}=$
$\frac{2}{5}=$
$\frac{8}{10}=$
$\frac{13}{40}=$
$\frac{46}{100}=$
$\frac{528}{100}=$
$\frac{120}{200}=$
$\frac{49}{50}=$
$\frac{2}{25}=$
3.2=
1.93=
$\frac{7}{18}≈$
$\frac{7}{20}=$
$\frac{19}{25}=$
2.08=
$1\frac{3}{19}≈$

1. 70.5%
2. 53%
3. 3.5%
4. 4250%
5. 115%
6. 77%
7. 59.7%
8. 1.5%
9. 65%
10. 40%
11. 80%
12. 32.5%
13. 46%
14. 528%
15. 60%
16. 98%
17. 8%
18. 320%
19. 193%
20. 38.9%
21. 35%
22. 76%
23. 208%
24. 115.8%