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

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

2:15
15:7
    3:2
7:4
10:21
    25:3
9:1
2:5
    7:3

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

$\frac23$
2
    0.4
$\frac{10}{21}$
0.2
   43.2
22.5
6
    0.2

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

31.5%
982%
209%
23%
250%
48%