1. 直接写出得数。
$0×\frac{4}{13}=$ $\quad16×\frac{3}{8}=$ $\quad4×\frac{3}{10}=$ $\quad\frac{3}{50}×4=$
$\frac{2}{3}×7=$ $\quad\frac{7}{9}×27=$ $\quad\frac{7}{15}×10=$ $\quad28×\frac{5}{8}=$
$\frac{8}{15}×6=$ $\quad9×\frac{5}{12}=$ $\quad\frac{8}{9}×21=$ $\quad\frac{19}{11}×22=$
$\frac{2}{7}×3=$ $\quad6×\frac{1}{9}=$ $\quad26×\frac{5}{6}=$ $\quad\frac{3}{32}×64=$
$8×\frac{1}{7}=$ $\quad\frac{2}{10}×2=$ $\quad12×\frac{4}{9}=$ $\quad\frac{62}{63}×9=$
$\frac{3}{4}×8=$ $\quad\frac{3}{7}×21=$ $\quad45×\frac{8}{35}=$ $\quad\frac{2}{45}×9=$

1. 0 6 $\dfrac{6}{5}$ $\dfrac{6}{25}$ $\dfrac{14}{3}$ 21 $\dfrac{14}{3}$ $\dfrac{35}{2}$ $\dfrac{16}{5}$ $\dfrac{15}{4}$ $\dfrac{56}{3}$ 38 $\dfrac{6}{7}$ $\dfrac{2}{3}$ $\dfrac{65}{3}$ 6 $\dfrac{8}{7}$ $\dfrac{2}{5}$ $\dfrac{16}{3}$ $\dfrac{62}{7}$ 6 9 $\dfrac{72}{7}$ $\dfrac{2}{5}$

2. 计算下面各题，能简算的要简算。
$36 - 12.4 - 17.6$ $\quad4.59×103 - 0.03×459$ $\quad(4.5 - 3.7)×(1.5 + 1.9)$
$6\frac{3}{7}-(\frac{3}{7}-\frac{2}{9})$ $\quad\frac{15}{8}-\frac{7}{10}-\frac{3}{10}+\frac{3}{8}$ $\quad\frac{13}{12}-(\frac{5}{12}+\frac{2}{9})-\frac{1}{12}$

2. 6 459 2.72 $6\dfrac{2}{9}$ $\dfrac{5}{4}$ $\dfrac{13}{36}$

(1) $\frac{9}{10},\frac{17}{20},\frac{8}{10},\frac{3}{4},\frac{7}{10},( )\_\_\_\_\_\_$( )
(2) $\frac{5}{512},\frac{5}{256},\frac{5}{128},\frac{5}{64},\frac{5}{32},(\dfrac{5}{16})$_________( )

思维提升
（1）$\dfrac{13}{20}$         $\dfrac{3}{5}$
（2）$\dfrac{5}{16}$         $\dfrac{5}{8}$