1)口算
建议用时4分钟 评价：☆☆☆
$200×20\% =$
$8×21\% =$
$120\%×0 =$
$0.9×100\% =$
$110÷10\% =$
$25×80\% =$
$12.5\%×8 =$
$18÷18\% =$
$0.5÷2 =$
$\frac{8}{15}÷\frac{2}{3} =$
$\frac{3}{8}+\frac{1}{4} =$
$(1-75\%)×12 =$
$\frac{5}{12}×\frac{4}{5} =$
$\frac{7}{19}×5.7 =$
$0.06÷30\% =$
$\frac{1}{2}÷\frac{5}{8}×50\% =$
$5.6÷10 =$
$\frac{27}{16}×\frac{4}{3} =$
$10÷12.5\% =$
$160×10\% =$
$30×5\% =$
$1.2÷6\% =$
$85\%-\frac{1}{2} =$
$\frac{3}{10}÷\frac{6}{5} =$

1. 40 1.68 0 0.9 1100 20 1 100 0.25 $\frac{4}{5}$ $\frac{5}{8}$ 3 $\frac{1}{3}$ 2.1 0.2 $\frac{2}{5}$ 0.56 $\frac{9}{4}$ 80 16 1.5 20 0.35 $\frac{1}{4}$

$3÷( )=75\%=\frac{15}{( )}=( )$(填小数)
$\frac{3}{8}=24÷( )=( )$(填小数)=()%
$\frac{( )}{25}=8÷( )=\frac{2}{5}=( )\%=( )$(填小数)

2. 4 20 0.75 64 0.375 37.5 10 20 40 0.4

3 脱式计算（能简算的要简算）
建议用时4分钟 评价：☆☆☆
$\frac{2}{3} + \frac{1}{3}×\frac{9}{10}$
$(1 - 48.5\%)×36$
$125×4×0.8×2.5$
$\frac{5}{14}÷\frac{4}{21}×\frac{16}{25}$
$(\frac{3}{4} - \frac{3}{16})×(\frac{2}{9} + \frac{1}{3})$
$\frac{13}{12}×8 + \frac{11}{12}÷12.5\%$

3. $\frac{29}{30}$ 18.54 1000 $\frac{6}{5}$ $\frac{5}{16}$ 16