1. (1) 先在下面的长方形中表示出 $\frac{4}{9}$,再按下面的算式分一分,涂一涂,并写出得数。

$\frac{4}{9}÷2= ( )×( )= ( )$ $\frac{4}{9}÷3= ( )×( )= ( )$
(2) $\frac{1}{4}÷8= \frac{( )}{( )} ◯ \frac{( )}{( )} = \frac{( )}{( )}$
$\frac{5}{6}÷3= \frac{( )}{( )} ◯ \frac{( )}{( )} = \frac{( )}{( )}$
$\frac{4}{9}÷2= ( )×( )= ( )$ $\frac{4}{9}÷3= ( )×( )= ( )$
(2) $\frac{1}{4}÷8= \frac{( )}{( )} ◯ \frac{( )}{( )} = \frac{( )}{( )}$
$\frac{5}{6}÷3= \frac{( )}{( )} ◯ \frac{( )}{( )} = \frac{( )}{( )}$
答案
1.
(1)$\frac {4}{9}×\frac {1}{2}=\frac {2}{9}$ $\frac {4}{9}×\frac {1}{3}=\frac {4}{27}$
(2)$\frac {1}{4}×\frac {1}{8}=\frac {1}{32}$ $\frac {5}{6}×\frac {1}{3}=\frac {5}{18}$
(1)$\frac {4}{9}×\frac {1}{2}=\frac {2}{9}$ $\frac {4}{9}×\frac {1}{3}=\frac {4}{27}$
(2)$\frac {1}{4}×\frac {1}{8}=\frac {1}{32}$ $\frac {5}{6}×\frac {1}{3}=\frac {5}{18}$
2. 计算下面各题。
$\frac{14}{15}÷2$ $\frac{21}{25}÷14$ $\frac{5}{8}÷10$ $\frac{12}{25}×15$
$\frac{14}{15}÷2$ $\frac{21}{25}÷14$ $\frac{5}{8}÷10$ $\frac{12}{25}×15$
答案
2.$\frac {7}{15}$ $\frac {3}{50}$ $\frac {1}{16}$ $\frac {36}{5}$
解析
$\frac{14}{15}÷2=\frac{14}{15}×\frac{1}{2}=\frac{7}{15}$
$\frac{21}{25}÷14=\frac{21}{25}×\frac{1}{14}=\frac{3}{50}$
$\frac{5}{8}÷10=\frac{5}{8}×\frac{1}{10}=\frac{1}{16}$
$\frac{12}{25}×15=\frac{12×15}{25}=\frac{36}{5}$
$\frac{21}{25}÷14=\frac{21}{25}×\frac{1}{14}=\frac{3}{50}$
$\frac{5}{8}÷10=\frac{5}{8}×\frac{1}{10}=\frac{1}{16}$
$\frac{12}{25}×15=\frac{12×15}{25}=\frac{36}{5}$
3. 一个正方形的周长是 $\frac{8}{15}m$,它的边长是多少米?
答案
3.$\frac {8}{15}÷4=\frac {8}{15}×\frac {1}{4}=\frac {2}{15}$(米)
4. 一根绳子长 $\frac{16}{17}$ 米,对折三次后,每段长多少米?
答案
4.$\frac {16}{17}÷2÷2÷2=\frac {2}{17}$(米)
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