一、直接写出得数。(共 24 分)
$\dfrac{3}{10}+\dfrac{3}{10}=$ $\dfrac{5}{9}-\dfrac{3}{9}=$ $\dfrac{(\quad)}{7}+\dfrac{(\quad)}{7}=\dfrac{4}{7}$ $\dfrac{6}{9}-\dfrac{2}{9}-\dfrac{3}{9}=$
$\dfrac{4}{7}-\dfrac{3}{7}=$ $\dfrac{4}{8}+\dfrac{2}{8}=$ $\dfrac{(\quad)}{10}-\dfrac{(\quad)}{10}=\dfrac{2}{10}$ $\dfrac{2}{10}+\dfrac{1}{10}+\dfrac{5}{10}=$
$\dfrac{1}{9}+\dfrac{4}{9}=$ $\dfrac{3}{5}-\dfrac{3}{5}=$ $\dfrac{(\quad)}{8}+\dfrac{(\quad)}{8}=1$ $\dfrac{4}{13}+\dfrac{4}{13}+\dfrac{5}{13}=$
$1-\dfrac{7}{8}=$ $\dfrac{7}{9}+\dfrac{1}{9}=$ $\dfrac{(\quad)}{9}-\dfrac{(\quad)}{9}=\dfrac{5}{9}$ $1-\dfrac{5}{9}-\dfrac{1}{9}=$
$\dfrac{10}{10}-\dfrac{5}{10}=$ $\dfrac{9}{10}-\dfrac{6}{10}=$ $\dfrac{(\quad)}{6}+\dfrac{(\quad)}{6}=\dfrac{4}{6}$ $\dfrac{4}{10}-\dfrac{3}{10}+\dfrac{7}{10}=$
$\dfrac{2}{6}+\dfrac{3}{6}=$ $\dfrac{8}{14}+\dfrac{2}{14}=$ $\dfrac{(\quad)}{20}-\dfrac{(\quad)}{20}=\dfrac{1}{20}$ $\dfrac{1}{7}+\dfrac{4}{7}-\dfrac{2}{7}=$
$\dfrac{3}{10}+\dfrac{3}{10}=$ $\dfrac{5}{9}-\dfrac{3}{9}=$ $\dfrac{(\quad)}{7}+\dfrac{(\quad)}{7}=\dfrac{4}{7}$ $\dfrac{6}{9}-\dfrac{2}{9}-\dfrac{3}{9}=$
$\dfrac{4}{7}-\dfrac{3}{7}=$ $\dfrac{4}{8}+\dfrac{2}{8}=$ $\dfrac{(\quad)}{10}-\dfrac{(\quad)}{10}=\dfrac{2}{10}$ $\dfrac{2}{10}+\dfrac{1}{10}+\dfrac{5}{10}=$
$\dfrac{1}{9}+\dfrac{4}{9}=$ $\dfrac{3}{5}-\dfrac{3}{5}=$ $\dfrac{(\quad)}{8}+\dfrac{(\quad)}{8}=1$ $\dfrac{4}{13}+\dfrac{4}{13}+\dfrac{5}{13}=$
$1-\dfrac{7}{8}=$ $\dfrac{7}{9}+\dfrac{1}{9}=$ $\dfrac{(\quad)}{9}-\dfrac{(\quad)}{9}=\dfrac{5}{9}$ $1-\dfrac{5}{9}-\dfrac{1}{9}=$
$\dfrac{10}{10}-\dfrac{5}{10}=$ $\dfrac{9}{10}-\dfrac{6}{10}=$ $\dfrac{(\quad)}{6}+\dfrac{(\quad)}{6}=\dfrac{4}{6}$ $\dfrac{4}{10}-\dfrac{3}{10}+\dfrac{7}{10}=$
$\dfrac{2}{6}+\dfrac{3}{6}=$ $\dfrac{8}{14}+\dfrac{2}{14}=$ $\dfrac{(\quad)}{20}-\dfrac{(\quad)}{20}=\dfrac{1}{20}$ $\dfrac{1}{7}+\dfrac{4}{7}-\dfrac{2}{7}=$
答案
$\dfrac{6}{10}$ $\dfrac{2}{9}$ $2$ $2$ $\dfrac{1}{9}$
$\dfrac{1}{7}$ $\dfrac{6}{8}$ $3$ $1$ $\dfrac{8}{10}$
$\dfrac{5}{9}$ $0$ $4$ $4$ $\dfrac{13}{13}$(或 $1$)
$\dfrac{1}{8}$ $\dfrac{8}{9}$ $6$ $1$ $\dfrac{3}{9}$
$\dfrac{5}{10}$ $\dfrac{3}{10}$ $2$ $2$ $\dfrac{8}{10}$
$\dfrac{5}{6}$ $\dfrac{10}{14}$ $2$ $1$ $\dfrac{3}{7}$
(括号里的填法不唯一)
$\dfrac{1}{7}$ $\dfrac{6}{8}$ $3$ $1$ $\dfrac{8}{10}$
$\dfrac{5}{9}$ $0$ $4$ $4$ $\dfrac{13}{13}$(或 $1$)
$\dfrac{1}{8}$ $\dfrac{8}{9}$ $6$ $1$ $\dfrac{3}{9}$
$\dfrac{5}{10}$ $\dfrac{3}{10}$ $2$ $2$ $\dfrac{8}{10}$
$\dfrac{5}{6}$ $\dfrac{10}{14}$ $2$ $1$ $\dfrac{3}{7}$
(括号里的填法不唯一)
二、用竖式计算,带☆的要验算。(共 20 分)
$63×58=$ ☆$52×43=$ $48×56=$
$54×44=$ ☆$34×86=$ $29×81=$
$63×58=$ ☆$52×43=$ $48×56=$
$54×44=$ ☆$34×86=$ $29×81=$
答案
$3654$ $2236$ $2688$
$2376$ $2924$ $2349$
竖式及验算略
$2376$ $2924$ $2349$
竖式及验算略
三、先看图写出分数,再比较大小。(每题 4 分,共 16 分)
1.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
2.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
3.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
4.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
1.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
2.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
3.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
4.
$\dfrac{(\quad)}{(\quad)} ◯ \dfrac{(\quad)}{(\quad)}$
答案
1. $\dfrac{1}{6}<\dfrac{1}{3}$
2. $\dfrac{5}{7}>\dfrac{2}{7}$
3. $\dfrac{4}{9}<\dfrac{6}{9}$
4. $\dfrac{1}{5}>\dfrac{1}{10}$
2. $\dfrac{5}{7}>\dfrac{2}{7}$
3. $\dfrac{4}{9}<\dfrac{6}{9}$
4. $\dfrac{1}{5}>\dfrac{1}{10}$
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