1. 直接写出得数。
$25×20\% = $
$40×15\% = $
$30\%÷6 = $
$\frac{7}{9}×\frac{3}{7} = $
$\frac{4}{15}×5 = $
$22×\frac{1}{22} = $
$\frac{2}{3}÷6 = $
$0.8×\frac{2}{3} = $
$0.9÷\frac{1}{3} = $
$15×\frac{3}{10} = $
$9÷\frac{3}{5} = $
$\frac{2}{3}÷\frac{2}{3} = $
$0÷40\% = $
$\frac{5}{6}÷5 = $
$10÷\frac{2}{7} = $
$\frac{4}{13}÷\frac{4}{5} = $
$1÷\frac{11}{12} = $
$6.4×\frac{5}{8} = $
$\frac{4}{5}÷24 = $
$\frac{2}{9}÷\frac{5}{9} = $
$\frac{5}{6}×30 = $

5
6
0.05
$\frac{1}{3}$
$\frac{4}{3}$
1
$\frac{1}{9}$
$\frac{8}{15}$
2.7
$\frac{9}{2}$
15
1
0
$\frac{1}{6}$
35
$\frac{5}{13}$
$\frac{12}{11}$
4
$\frac{1}{30}$
$\frac{2}{5}$
25

2. 把下面各比化成最简单的整数比。
$\frac{2}{3}:5 = $
$0.75:0.35 = $
$60:40 = $
$28:16 = $
$\frac{5}{6}:1.75 = $
$12.5:1.5 = $
$7.2:0.8 = $
$0.5:\frac{5}{4} = $
$\frac{7}{8}:0.375 = $

$\frac{2}{3}:5 = 2:15$
$0.75:0.35 = 15:7$
$60:40 = 3:2$
$28:16 = 7:4$
$\frac{5}{6}:1.75 = 10:21$
$12.5:1.5 = 25:3$
$7.2:0.8 = 9:1$
$0.5:\frac{5}{4} = 2:5$
$\frac{7}{8}:0.375 = 7:3$

3. 求下面各比的比值。
$\frac{4}{9}:\frac{2}{3}=$
$9.6:4.8=$
$18:45=$
$\frac{5}{7}:1.5=$
$1.2:6=$
$18:\frac{5}{12}=$
$5:\frac{2}{9}=$
$2.1:0.35=$
$0.3:1.5=$

1.
$\frac{4}{9}:\frac{2}{3}$
$=\frac{4}{9}÷\frac{2}{3}$
$=\frac{4}{9}×\frac{3}{2}$
$=\frac{2}{3}$
2.
$9.6:4.8$
$=9.6÷4.8$
$=2$
3.
$18:45$
$=18÷45$
$=0.4$
4.
$\frac{5}{7}:1.5$
$=\frac{5}{7}÷1.5$
$=\frac{5}{7}÷\frac{3}{2}$
$=\frac{5}{7}×\frac{2}{3}$
$=\frac{10}{21}$
5.
$1.2:6$
$=1.2÷6$
$=0.2$
6.
$18:\frac{5}{12}$
$=18÷\frac{5}{12}$
$=18×\frac{12}{5}$
$=\frac{216}{5}$
7.
$5:\frac{2}{9}$
$=5÷\frac{2}{9}$
$=5×\frac{9}{2}$
$=\frac{45}{2}$
8.
$2.1:0.35$
$=2.1÷0.35$
$=6$
9.
$0.3:1.5$
$=0.3÷1.5$
$=0.2$

4. 把下面的小数和分数改写成百分数。
$0.315 = $
$9.82 = $
$2.09 = $
$\frac{46}{200} = $
$\frac{5}{2} = $
$\frac{12}{25} = $

$0.315 = 31.5\%$；
$9.82 = 982\%$；
$2.09 = 209\%$；
$\frac{46}{200} = 0.23=23\%$；
$\frac{5}{2} = 2.5=250\%$；
$\frac{12}{25} = 0.48=48\%$。