一、口算。
$ \frac{8}{10} - \frac{5}{10} = $
$ \frac{3}{4} + \frac{11}{4} = $
$ \frac{11}{6} - \frac{7}{6} = $
$ \frac{2}{7} + \frac{11}{7} = $
$ \frac{13}{15} - \frac{1}{15} = $
$ \frac{11}{8} + \frac{4}{8} = $
$ \frac{9}{12} - \frac{4}{12} = $
$ \frac{5}{13} + \frac{6}{13} = $
$ \frac{18}{24} - \frac{7}{24} = $
$ 0.65 × 4 = $
$ 21.5 + 9.5 = $
$ 4 ÷ 5 - 0.6 = $
$ 6.3 + 2.75 = $
$ 8.1 ÷ 30 = $
$ 1.5 ÷ 0.3 × 0.4 = $
$ 2.42 + 0.58 = $
$ 5.4 ÷ 0.09 = $
$ (8.1 - 0.1) ÷ 0.1 = $
$ 0.84 ÷ 0.06 = $
$ 4 × 0.125 = $
$ 2.4 + (3.4 - 1.2) = $
$ 5.82 + 3.28 = $
$ 2.82 - 0.6 = $
$ 4.8 - 4.8 × 0.1 = $

一、$\frac{3}{10}$ $\frac{7}{2}$ $\frac{2}{3}$
$\frac{13}{7}$ $\frac{4}{5}$ $\frac{15}{8}$
$\frac{5}{12}$ $\frac{11}{13}$ $\frac{11}{24}$
$2.6$ $31$ $0.2$
$9.05$ $0.27$ $2$
$3$ $60$ $80$
$14$ $0.5$ $4.6$
$9.1$ $2.22$ $4.32$

二、先通分，再比较大小。
$ \frac{13}{4} $$和$$ \frac{10}{3} $
$ \frac{11}{12} $$和$$ \frac{35}{36} $
$ \frac{13}{24} $$和$$ \frac{9}{16} $
$ \frac{7}{6} $$和$$ \frac{8}{7} $
$ \frac{9}{14} $$和$$ \frac{13}{21} $
$ \frac{5}{16} $$和$$ \frac{25}{64} $

二、$\frac{13}{4}=\frac{39}{12}$ $\frac{10}{3}=\frac{40}{12}$ $\frac{13}{4}＜\frac{10}{3}$
$\frac{11}{12}=\frac{33}{36}$ $\frac{35}{36}=\frac{35}{36}$ $\frac{11}{12}＜\frac{35}{36}$
$\frac{13}{24}=\frac{26}{48}$ $\frac{9}{16}=\frac{27}{48}$ $\frac{13}{24}＜\frac{9}{16}$
$\frac{7}{6}=\frac{49}{42}$ $\frac{8}{7}=\frac{48}{42}$ $\frac{7}{6}＞\frac{8}{7}$
$\frac{9}{14}=\frac{27}{42}$ $\frac{13}{21}=\frac{26}{42}$ $\frac{9}{14}＞\frac{13}{21}$
$\frac{5}{16}=\frac{20}{64}$ $\frac{25}{64}=\frac{25}{64}$ $\frac{5}{16}＜\frac{25}{64}$