1. 直接写得数。
口算(1)
同学们,这里有40道题目,每做对1道题可夺得一面旗帜,比一比5分钟的时间里,谁夺得的旗帜最多。
$\frac{3}{8} × \frac{4}{3} =$
$\frac{3}{4} ÷ \frac{1}{2} =$
$8 - \frac{3}{4} =$
$\frac{1}{7} × \frac{7}{4} =$
$\frac{5}{3} × \frac{3}{2} =$
$\frac{4}{9} × 2 =$
$12 × \frac{1}{3} =$
$\frac{2}{7} × \frac{1}{3} =$
$6 × \frac{7}{24} =$
$\frac{3}{4} × \frac{1}{6} =$
$12 ÷ \frac{6}{7} =$
$\frac{5}{6} × \frac{2}{3} =$
$\frac{8}{9} × \frac{1}{4} =$
$\frac{7}{6} × \frac{4}{9} =$
$\frac{1}{4} + \frac{3}{4} =$
$\frac{5}{6} × 18 =$
$\frac{7}{12} ÷ \frac{7}{4} =$
$\frac{3}{4} × \frac{4}{7} =$
$\frac{49}{36} × \frac{3}{7} =$
$\frac{4}{11} ÷ 2 =$
$\frac{1}{28} + \frac{1}{14} =$
$\frac{9}{4} × 16 =$
$\frac{5}{12} - \frac{1}{3} =$
$\frac{7}{24} × \frac{3}{7} =$
$\frac{15}{16} ÷ \frac{5}{12} =$
$7 - \frac{7}{8} =$
$\frac{8}{9} × \frac{3}{2} =$
$\frac{1}{9} × \frac{3}{4} =$
$\frac{1}{4} + \frac{5}{2} =$
$\frac{5}{9} × \frac{4}{5} =$
$2 ÷ \frac{1}{10} =$
$26 × \frac{4}{13} =$
$\frac{27}{40} ÷ \frac{27}{20} =$
$\frac{3}{5} + \frac{1}{10} =$
$\frac{5}{6} - \frac{1}{2} =$
$42 ÷ \frac{21}{13} =$
$\frac{10}{21} + \frac{13}{21} - \frac{2}{21} =$
$\frac{5}{16} ÷ \frac{5}{8} × 2 =$
$\frac{3}{5} × \frac{2}{3} × \frac{5}{6} =$
$\frac{1}{5} ÷ \frac{1}{2} ÷ \frac{1}{5} =$
结果统计:我夺了()面旗帜。

$\frac{3}{8} × \frac{4}{3} = \frac{1}{2}$
$\frac{3}{4} ÷ \frac{1}{2} = \frac{3}{2}$
$8 - \frac{3}{4} = 7\frac{1}{4}$
$\frac{1}{7} × \frac{7}{4} = \frac{1}{4}$
$\frac{5}{3} × \frac{3}{2} = \frac{5}{2}$
$\frac{4}{9} × 2 = \frac{8}{9}$
$12 × \frac{1}{3} = 4$
$\frac{2}{7} × \frac{1}{3} = \frac{2}{21}$
$6 × \frac{7}{24} = \frac{7}{4}$
$\frac{3}{4} × \frac{1}{6} = \frac{1}{8}$
$12 ÷ \frac{6}{7} = 14$
$\frac{5}{6} × \frac{2}{3} = \frac{5}{9}$
$\frac{8}{9} × \frac{1}{4} = \frac{2}{9}$
$\frac{7}{6} × \frac{4}{9} = \frac{14}{27}$
$\frac{1}{4} + \frac{3}{4} = 1$
$\frac{5}{6} × 18 = 15$
$\frac{7}{12} ÷ \frac{7}{4} = \frac{1}{3}$
$\frac{3}{4} × \frac{4}{7} = \frac{3}{7}$
$\frac{49}{36} × \frac{3}{7} = \frac{7}{12}$
$\frac{4}{11} ÷ 2 = \frac{2}{11}$
$\frac{1}{28} + \frac{1}{14} = \frac{3}{28}$
$\frac{9}{4} × 16 = 36$
$\frac{5}{12} - \frac{1}{3} = \frac{1}{12}$
$\frac{7}{24} × \frac{3}{7} = \frac{1}{8}$
$\frac{15}{16} ÷ \frac{5}{12} = \frac{9}{4}$
$7 - \frac{7}{8} = 6\frac{1}{8}$
$\frac{8}{9} × \frac{3}{2} = \frac{4}{3}$
$\frac{1}{9} × \frac{3}{4} = \frac{1}{12}$
$\frac{1}{4} + \frac{5}{2} = \frac{11}{4}$
$\frac{5}{9} × \frac{4}{5} = \frac{4}{9}$
$2 ÷ \frac{1}{10} = 20$
$26 × \frac{4}{13} = 8$
$\frac{27}{40} ÷ \frac{27}{20} = \frac{1}{2}$
$\frac{3}{5} + \frac{1}{10} = \frac{7}{10}$
$\frac{5}{6} - \frac{1}{2} = \frac{1}{3}$
$42 ÷ \frac{21}{13} = 26$
$\frac{10}{21} + \frac{13}{21} - \frac{2}{21} = 1$
$\frac{5}{16} ÷ \frac{5}{8} × 2 = 1$
$\frac{3}{5} × \frac{2}{3} × \frac{5}{6} = \frac{1}{3}$
$\frac{1}{5} ÷ \frac{1}{2} ÷ \frac{1}{5} = 2$
结果统计:我夺了(40)面旗帜。