一、口算。
$ \frac{1}{5} × 40 = $ $ \frac{3}{7} × 14 = $ $ \frac{5}{6} × 12 = $
$ \frac{5}{6} × 8 = $ $ \frac{3}{10} × 5 = $ $ \frac{2}{5} × 12 = $
$ \frac{17}{18} × 54 = $ $ \frac{19}{24} × 3 = $ $ 66 × \frac{3}{22} = $
$ \frac{10}{39} × 13 = $ $ \frac{16}{39} × 26 = $ $ \frac{1}{48} × 6 = $
$ 5 × \frac{5}{32} = $ $ \frac{13}{100} × 20 = $ $ \frac{9}{32} × 3 = $
$ \frac{67}{81} × 9 = $ $ 100 × \frac{6}{25} = $ $ \frac{5}{9} × 6 = $
$ \frac{7}{12} × 4 = $ $ \frac{2}{5} × 2 = $ $ 3 × \frac{2}{7} = $
$ 7 × \frac{23}{91} = $ $ \frac{3}{17} × 5 = $ $ \frac{2}{51} × 17 = $

8 6 10
$\dfrac{20}{3}$ $\dfrac{3}{2}$ $\dfrac{24}{5}$
51 $\dfrac{19}{8}$ 9
$\dfrac{10}{3}$ $\dfrac{32}{3}$ $\dfrac{1}{8}$
$\dfrac{25}{32}$ $\dfrac{13}{5}$ $\dfrac{27}{32}$
$\dfrac{67}{9}$ 24 $\dfrac{10}{3}$
$\dfrac{7}{3}$ $\dfrac{4}{5}$ $\dfrac{6}{7}$
$\dfrac{23}{13}$ $\dfrac{15}{17}$ $\dfrac{2}{3}$

二、在$◯$里填“＞”“＜”或“=”。
$ 0 × \frac{7}{9} ◯ 999 × 0 $
$ 9 × \frac{2}{3} ◯ \frac{2}{3} × 9 $
$ \frac{3}{4} × 4 ◯ \frac{3}{4} $
$ 10 × \frac{4}{5} ◯ \frac{3}{4} × 8 $
$ \frac{3}{4} × 1 ◯ \frac{3}{4} $
$ \frac{7}{13} × 0 ◯ \frac{7}{13} $
$ \frac{7}{8} × 6 ◯ \frac{7}{8} × 4 $
$ \frac{2}{3} × 11 ◯ \frac{3}{4} × 11 $
$ \frac{1}{6} × 10 ◯ \frac{1}{6} $

= = ＞
＞ = ＜
＞ ＜ ＞