一、口算。（每题1分，共30分）
$94 - 57 =$ $39×2 =$ $68÷4 =$
$25×8 =$ $75÷3 =$ $79 + 12 =$
$360÷4 =$ $40×22 =$ $660÷3 =$
$408×2 =$ $31×30 =$ $50×80 =$
$16×50 =$ $480÷2 =$ $428÷4 =$
$822×2 =$ $125 - 25 =$ $637÷7 =$
$700÷5 =$ $12×30 =$ $20×38 =$
$704 + 45 =$ $144÷4 =$ $40×14 =$
$\frac{5}{9} + \frac{2}{9} =$ $\frac{7}{9} - \frac{4}{9} =$ $\frac{4}{8} + \frac{1}{8} =$
$\frac{7}{8} - \frac{1}{8} =$ $\frac{5}{6} - \frac{2}{6} =$ $\frac{5}{10} - \frac{3}{10} =$

一、37 78 17
200 25 91
90 880 220
816 930 4000
800 240 107
1644 100 91
140 360 760
749 36 560
$\dfrac{7}{9}$ $\dfrac{3}{9}$ $\dfrac{5}{8}$
$\dfrac{6}{8}$ $\dfrac{3}{6}$ $\dfrac{2}{10}$

二、连一连。（共10分）

二、