1. 口算。
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,比一比5分钟的时间里,谁夺得的旗帜最多。
$\frac{22}{25} ÷ 11=$ $\frac{4}{27} × \frac{3}{8}=$ $\frac{3}{5} × 45=$ $\frac{1}{2} × \frac{1}{3} × \frac{1}{4}=$
$\frac{1}{7} × \frac{14}{9}=$ $\frac{8}{9} ÷ \frac{2}{3}=$ $\frac{5}{4} × \frac{1}{50}=$ $49 × \frac{3}{7} × \frac{6}{7}=$
$\frac{8}{9} ÷ 4=$ $\frac{9}{14} × \frac{7}{15}=$ $\frac{3}{8} ÷ \frac{1}{3}=$ $\frac{3}{8} ÷ \frac{1}{8} × \frac{1}{9}=$
$6 ÷ \frac{3}{4}=$ $\frac{7}{10} ÷ \frac{14}{15}=$ $\frac{2}{3} × \frac{5}{8}=$ $\frac{5}{6} × \frac{1}{3} ÷ \frac{5}{9}=$
$\frac{7}{39} × \frac{3}{7}=$ $\frac{14}{5} × \frac{3}{8}=$ $\frac{19}{20} × 2=$ $\frac{1}{6} × \frac{3}{5} × \frac{2}{3}=$
$\frac{7}{9} ÷ 6=$ $\frac{7}{16} × \frac{4}{21}=$ $\frac{5}{9} ÷ \frac{4}{9}=$ $\frac{3}{4} ÷ \frac{1}{3} × \frac{7}{9}=$
$\frac{3}{14} ÷ \frac{3}{7}=$ $\frac{3}{16} × \frac{8}{9}=$ $\frac{5}{8} ÷ \frac{5}{6}=$ $\frac{2}{25} × \frac{5}{12} × 6=$
$\frac{2}{9} ÷ \frac{3}{11}=$ $\frac{7}{16} × \frac{8}{21}=$ $\frac{8}{9} ÷ \frac{4}{5}=$ $\frac{3}{4} × \frac{1}{9} × 18=$
$\frac{7}{8} ÷ \frac{1}{6}=$ $\frac{7}{13} × 39=$ $\frac{3}{10} ÷ \frac{9}{2}=$ $\frac{5}{11} × \frac{6}{7} × \frac{11}{12}=$
$\frac{24}{5} × \frac{3}{8}=$ $\frac{9}{16} × \frac{8}{27}=$ $480 ÷ \frac{24}{5}=$ $1 ÷ \frac{8}{9} ÷ \frac{9}{16}=$
结果统计:我夺了()面旗帜。
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,比一比5分钟的时间里,谁夺得的旗帜最多。
$\frac{22}{25} ÷ 11=$ $\frac{4}{27} × \frac{3}{8}=$ $\frac{3}{5} × 45=$ $\frac{1}{2} × \frac{1}{3} × \frac{1}{4}=$
$\frac{1}{7} × \frac{14}{9}=$ $\frac{8}{9} ÷ \frac{2}{3}=$ $\frac{5}{4} × \frac{1}{50}=$ $49 × \frac{3}{7} × \frac{6}{7}=$
$\frac{8}{9} ÷ 4=$ $\frac{9}{14} × \frac{7}{15}=$ $\frac{3}{8} ÷ \frac{1}{3}=$ $\frac{3}{8} ÷ \frac{1}{8} × \frac{1}{9}=$
$6 ÷ \frac{3}{4}=$ $\frac{7}{10} ÷ \frac{14}{15}=$ $\frac{2}{3} × \frac{5}{8}=$ $\frac{5}{6} × \frac{1}{3} ÷ \frac{5}{9}=$
$\frac{7}{39} × \frac{3}{7}=$ $\frac{14}{5} × \frac{3}{8}=$ $\frac{19}{20} × 2=$ $\frac{1}{6} × \frac{3}{5} × \frac{2}{3}=$
$\frac{7}{9} ÷ 6=$ $\frac{7}{16} × \frac{4}{21}=$ $\frac{5}{9} ÷ \frac{4}{9}=$ $\frac{3}{4} ÷ \frac{1}{3} × \frac{7}{9}=$
$\frac{3}{14} ÷ \frac{3}{7}=$ $\frac{3}{16} × \frac{8}{9}=$ $\frac{5}{8} ÷ \frac{5}{6}=$ $\frac{2}{25} × \frac{5}{12} × 6=$
$\frac{2}{9} ÷ \frac{3}{11}=$ $\frac{7}{16} × \frac{8}{21}=$ $\frac{8}{9} ÷ \frac{4}{5}=$ $\frac{3}{4} × \frac{1}{9} × 18=$
$\frac{7}{8} ÷ \frac{1}{6}=$ $\frac{7}{13} × 39=$ $\frac{3}{10} ÷ \frac{9}{2}=$ $\frac{5}{11} × \frac{6}{7} × \frac{11}{12}=$
$\frac{24}{5} × \frac{3}{8}=$ $\frac{9}{16} × \frac{8}{27}=$ $480 ÷ \frac{24}{5}=$ $1 ÷ \frac{8}{9} ÷ \frac{9}{16}=$
结果统计:我夺了()面旗帜。
答案
$\frac{22}{25} ÷ 11=\frac{2}{25}$
$\frac{4}{27} × \frac{3}{8}=\frac{1}{18}$
$\frac{3}{5} × 45=27$
$\frac{1}{2} × \frac{1}{3} × \frac{1}{4}=\frac{1}{24}$
$\frac{1}{7} × \frac{14}{9}=\frac{2}{9}$
$\frac{8}{9} ÷ \frac{2}{3}=\frac{4}{3}$
$\frac{5}{4} × \frac{1}{50}=\frac{1}{40}$
$49 × \frac{3}{7} × \frac{6}{7}=18$
$\frac{8}{9} ÷ 4=\frac{2}{9}$
$\frac{9}{14} × \frac{7}{15}=\frac{3}{10}$
$\frac{3}{8} ÷ \frac{1}{3}=\frac{9}{8}$
$\frac{3}{8} ÷ \frac{1}{8} × \frac{1}{9}=\frac{1}{3}$
$6 ÷ \frac{3}{4}=8$
$\frac{7}{10} ÷ \frac{14}{15}=\frac{3}{4}$
$\frac{2}{3} × \frac{5}{8}=\frac{5}{12}$
$\frac{5}{6} × \frac{1}{3} ÷ \frac{5}{9}=\frac{1}{2}$
$\frac{7}{39} × \frac{3}{7}=\frac{1}{13}$
$\frac{14}{5} × \frac{3}{8}=\frac{21}{20}$
$\frac{19}{20} × 2=\frac{19}{10}$
$\frac{1}{6} × \frac{3}{5} × \frac{2}{3}=\frac{1}{15}$
$\frac{7}{9} ÷ 6=\frac{7}{54}$
$\frac{7}{16} × \frac{4}{21}=\frac{1}{12}$
$\frac{5}{9} ÷ \frac{4}{9}=\frac{5}{4}$
$\frac{3}{4} ÷ \frac{1}{3} × \frac{7}{9}=\frac{7}{4}$
$\frac{3}{14} ÷ \frac{3}{7}=\frac{1}{2}$
$\frac{3}{16} × \frac{8}{9}=\frac{1}{6}$
$\frac{5}{8} ÷ \frac{5}{6}=\frac{3}{4}$
$\frac{2}{25} × \frac{5}{12} × 6=\frac{1}{5}$
$\frac{2}{9} ÷ \frac{3}{11}=\frac{22}{27}$
$\frac{7}{16} × \frac{8}{21}=\frac{1}{6}$
$\frac{8}{9} ÷ \frac{4}{5}=\frac{10}{9}$
$\frac{3}{4} × \frac{1}{9} × 18=3$
$\frac{7}{8} ÷ \frac{1}{6}=\frac{21}{4}$
$\frac{7}{13} × 39=21$
$\frac{3}{10} ÷ \frac{9}{2}=\frac{1}{15}$
$\frac{5}{11} × \frac{6}{7} × \frac{11}{12}=\frac{5}{14}$
$\frac{24}{5} × \frac{3}{8}=\frac{9}{5}$
$\frac{9}{16} × \frac{8}{27}=\frac{1}{6}$
$480 ÷ \frac{24}{5}=100$
$1 ÷ \frac{8}{9} ÷ \frac{9}{16}=2$
结果统计:我夺了(40)面旗帜。
$\frac{4}{27} × \frac{3}{8}=\frac{1}{18}$
$\frac{3}{5} × 45=27$
$\frac{1}{2} × \frac{1}{3} × \frac{1}{4}=\frac{1}{24}$
$\frac{1}{7} × \frac{14}{9}=\frac{2}{9}$
$\frac{8}{9} ÷ \frac{2}{3}=\frac{4}{3}$
$\frac{5}{4} × \frac{1}{50}=\frac{1}{40}$
$49 × \frac{3}{7} × \frac{6}{7}=18$
$\frac{8}{9} ÷ 4=\frac{2}{9}$
$\frac{9}{14} × \frac{7}{15}=\frac{3}{10}$
$\frac{3}{8} ÷ \frac{1}{3}=\frac{9}{8}$
$\frac{3}{8} ÷ \frac{1}{8} × \frac{1}{9}=\frac{1}{3}$
$6 ÷ \frac{3}{4}=8$
$\frac{7}{10} ÷ \frac{14}{15}=\frac{3}{4}$
$\frac{2}{3} × \frac{5}{8}=\frac{5}{12}$
$\frac{5}{6} × \frac{1}{3} ÷ \frac{5}{9}=\frac{1}{2}$
$\frac{7}{39} × \frac{3}{7}=\frac{1}{13}$
$\frac{14}{5} × \frac{3}{8}=\frac{21}{20}$
$\frac{19}{20} × 2=\frac{19}{10}$
$\frac{1}{6} × \frac{3}{5} × \frac{2}{3}=\frac{1}{15}$
$\frac{7}{9} ÷ 6=\frac{7}{54}$
$\frac{7}{16} × \frac{4}{21}=\frac{1}{12}$
$\frac{5}{9} ÷ \frac{4}{9}=\frac{5}{4}$
$\frac{3}{4} ÷ \frac{1}{3} × \frac{7}{9}=\frac{7}{4}$
$\frac{3}{14} ÷ \frac{3}{7}=\frac{1}{2}$
$\frac{3}{16} × \frac{8}{9}=\frac{1}{6}$
$\frac{5}{8} ÷ \frac{5}{6}=\frac{3}{4}$
$\frac{2}{25} × \frac{5}{12} × 6=\frac{1}{5}$
$\frac{2}{9} ÷ \frac{3}{11}=\frac{22}{27}$
$\frac{7}{16} × \frac{8}{21}=\frac{1}{6}$
$\frac{8}{9} ÷ \frac{4}{5}=\frac{10}{9}$
$\frac{3}{4} × \frac{1}{9} × 18=3$
$\frac{7}{8} ÷ \frac{1}{6}=\frac{21}{4}$
$\frac{7}{13} × 39=21$
$\frac{3}{10} ÷ \frac{9}{2}=\frac{1}{15}$
$\frac{5}{11} × \frac{6}{7} × \frac{11}{12}=\frac{5}{14}$
$\frac{24}{5} × \frac{3}{8}=\frac{9}{5}$
$\frac{9}{16} × \frac{8}{27}=\frac{1}{6}$
$480 ÷ \frac{24}{5}=100$
$1 ÷ \frac{8}{9} ÷ \frac{9}{16}=2$
结果统计:我夺了(40)面旗帜。
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