1）口算
建议用时4分钟 评价：☆☆☆
$3×\frac{8}{11}=$
$\frac{3}{8}×\frac{5}{6}=$
$7×\frac{4}{21}=$
$\frac{8}{9}×\frac{9}{13}=$
$\frac{5}{6}×\frac{6}{7}=$
$\frac{3}{4}×\frac{8}{9}=$
$\frac{5}{14}×\frac{7}{10}=$
$10×\frac{18}{25}=$
$\frac{3}{11}×\frac{22}{39}=$
$\frac{21}{25}×\frac{5}{7}=$
$15×\frac{9}{20}=$
$\frac{9}{28}×\frac{14}{27}=$
$\frac{6}{5}×\frac{5}{3}=$
$\frac{5}{16}×\frac{8}{15}=$
$\frac{7}{8}×\frac{4}{21}=$
$\frac{19}{20}×\frac{5}{38}=$
$\frac{5}{8}×\frac{2}{3}=$
$\frac{9}{11}×\frac{5}{6}=$
$\frac{4}{19}×\frac{19}{4}=$
$\frac{15}{21}×\frac{4}{15}=$

1. $\frac{24}{11}$ $\frac{5}{16}$ $\frac{4}{3}$ $\frac{8}{13}$ $\frac{5}{7}$ $\frac{2}{3}$ $\frac{1}{4}$ $\frac{36}{5}$ $\frac{2}{13}$ $\frac{3}{5}$ $\frac{27}{4}$ $\frac{1}{6}$ 2 $\frac{1}{6}$ $\frac{1}{6}$ $\frac{1}{8}$ $\frac{5}{12}$ $\frac{15}{22}$ 1 $\frac{4}{21}$

2 比大小（在〇里填上“＜”“＞”或“=”） 建议用时2分钟 评价：☆☆☆
$\frac{5}{8}×\frac{3}{4} ◯ \frac{5}{8}$
$\frac{16}{25}×1 ◯ \frac{16}{25}$
$\frac{1}{6}×\frac{3}{8} ◯ \frac{1}{4}×\frac{1}{4}$
$\frac{5}{12}×\frac{8}{9} ◯ \frac{5}{12}$
$\frac{8}{11}×\frac{4}{3} ◯ \frac{8}{11}$
$\frac{1}{3}×\frac{1}{2} ◯ \frac{1}{6}×\frac{2}{3}$

2. ＜ = = ＜ ＞ ＞

3 笔算（照样子，算一算） 建议用时2分钟 评价：☆☆☆
$\frac{18}{35}×\frac{49}{16}=\frac{18}{35}×\frac{49}{16}=\frac{63}{40}$
$\frac{12}{55}×\frac{11}{8}$
$\frac{63}{26}×\frac{39}{28}$
$\frac{13}{56}×\frac{35}{26}$
$\frac{11}{45}×\frac{36}{77}$
$\frac{7}{96}×\frac{24}{63}$

解：
1. $\frac{12}{55}×\frac{11}{8}=\frac{\overset{3}{\cancel{12}}}{\underset{5}{\cancel{55}}}×\frac{\overset{1}{\cancel{11}}}{\underset{2}{\cancel{8}}}=\frac{3}{10}$
2. $\frac{63}{26}×\frac{39}{28}=\frac{\overset{9}{\cancel{63}}}{\underset{2}{\cancel{26}}}×\frac{\overset{3}{\cancel{39}}}{\underset{4}{\cancel{28}}}=\frac{27}{8}$
3. $\frac{13}{56}×\frac{35}{26}=\frac{\overset{1}{\cancel{13}}}{\underset{8}{\cancel{56}}}×\frac{\overset{5}{\cancel{35}}}{\underset{2}{\cancel{26}}}=\frac{5}{16}$
4. $\frac{11}{45}×\frac{36}{77}=\frac{\overset{1}{\cancel{11}}}{\underset{5}{\cancel{45}}}×\frac{\overset{4}{\cancel{36}}}{\underset{7}{\cancel{77}}}=\frac{4}{35}$
5. $\frac{7}{96}×\frac{24}{63}=\frac{\overset{1}{\cancel{7}}}{\underset{4}{\cancel{96}}}×\frac{\overset{1}{\cancel{24}}}{\underset{9}{\cancel{63}}}=\frac{1}{36}$

最值问题（1）（）里最大能填几？ （2）（）里最小能填几？

4. (1)15 10 (2)3 9