一、看图计算。

$\frac{2}{3}×\frac{1}{4}= $
$\frac{2}{3}×\frac{2}{3}= $
$\frac{
$\frac{2}{3}×\frac{1}{4}= $
$\frac{1}{6}$
$\frac{2}{3}×\frac{2}{3}= $
$\frac{4}{9}$
$\frac{
1
}{2
}×\frac{1
}{3
}= \frac{1
}{6
}$答案
$\frac{1}{6}$
$\frac{4}{9}$
$\frac{1}{2}×\frac{1}{3}= \frac{1}{6}$
$\frac{4}{9}$
$\frac{1}{2}×\frac{1}{3}= \frac{1}{6}$
二、直接写出得数。
$\frac{1}{5}×\frac{3}{4}=$
$\frac{3}{10}×\frac{2}{3}=$
$\frac{1}{3}×\frac{1}{4}=$
$\frac{11}{12}×\frac{1}{11}=$
$\frac{5}{9}×\frac{2}{3}=$
$\frac{6}{7}×\frac{5}{6}=$
$\frac{9}{20}×\frac{5}{21}=$
$\frac{19}{100}×\frac{20}{19}=$
$\frac{1}{10}×\frac{5}{8}=$
$\frac{7}{44}×\frac{11}{21}=$
$\frac{3}{4}×\frac{3}{4}=$
$\frac{7}{12}×\frac{4}{7}=$
$\frac{1}{5}×\frac{3}{4}=$
$\frac{3}{20}$
$\frac{3}{10}×\frac{2}{3}=$
$\frac{1}{5}$
$\frac{1}{3}×\frac{1}{4}=$
$\frac{1}{12}$
$\frac{11}{12}×\frac{1}{11}=$
$\frac{1}{12}$
$\frac{5}{9}×\frac{2}{3}=$
$\frac{10}{27}$
$\frac{6}{7}×\frac{5}{6}=$
$\frac{5}{7}$
$\frac{9}{20}×\frac{5}{21}=$
$\frac{3}{28}$
$\frac{19}{100}×\frac{20}{19}=$
$\frac{1}{5}$
$\frac{1}{10}×\frac{5}{8}=$
$\frac{1}{16}$
$\frac{7}{44}×\frac{11}{21}=$
$\frac{1}{12}$
$\frac{3}{4}×\frac{3}{4}=$
$\frac{9}{16}$
$\frac{7}{12}×\frac{4}{7}=$
$\frac{1}{3}$
答案
$\frac{3}{20}$
$\frac{1}{5}$
$\frac{1}{12}$
$\frac{1}{12}$
$\frac{10}{27}$
$\frac{5}{7}$
$\frac{3}{28}$
$\frac{1}{5}$
$\frac{1}{16}$
$\frac{1}{12}$
$\frac{9}{16}$
$\frac{1}{3}$
$\frac{1}{5}$
$\frac{1}{12}$
$\frac{1}{12}$
$\frac{10}{27}$
$\frac{5}{7}$
$\frac{3}{28}$
$\frac{1}{5}$
$\frac{1}{16}$
$\frac{1}{12}$
$\frac{9}{16}$
$\frac{1}{3}$
三、列式计算。
1. 一支粉笔长$\frac{4}{5}\mathrm{dm}$。

2. (1)$\frac{5}{6}\mathrm{kg}的\frac{2}{3}$是多少千克?
(2)$1\frac{2}{9}\mathrm{t}的\frac{3}{5}$是多少吨?
1. 一支粉笔长$\frac{4}{5}\mathrm{dm}$。
2. (1)$\frac{5}{6}\mathrm{kg}的\frac{2}{3}$是多少千克?
(2)$1\frac{2}{9}\mathrm{t}的\frac{3}{5}$是多少吨?
答案
1.
(1) $\frac{4}{5} × 2 = \frac{8}{5} (dm)$
(2) $\frac{4}{5} × \frac{1}{2} = \frac{2}{5} (dm)$
(3) $\frac{4}{5} × \frac{3}{4} = \frac{3}{5} (dm)$
2.
(1) $\frac{5}{6} × \frac{2}{3} = \frac{5}{9} (kg)$
(2) $1\frac{2}{9} × \frac{3}{5} = \frac{11}{9} × \frac{3}{5} = \frac{11}{15} (t)$
(1) $\frac{4}{5} × 2 = \frac{8}{5} (dm)$
(2) $\frac{4}{5} × \frac{1}{2} = \frac{2}{5} (dm)$
(3) $\frac{4}{5} × \frac{3}{4} = \frac{3}{5} (dm)$
2.
(1) $\frac{5}{6} × \frac{2}{3} = \frac{5}{9} (kg)$
(2) $1\frac{2}{9} × \frac{3}{5} = \frac{11}{9} × \frac{3}{5} = \frac{11}{15} (t)$