Subtract the following:
1. [tex]\frac{3}{8}-\frac{1}{6}[/tex]
2. [tex]\frac{5}{11}-\frac{1}{3}[/tex]
3. [tex]\frac{9}{20}-\frac{1}{4}[/tex]
4. [tex]\frac{8}{7}-\frac{1}{8}-\frac{3}{4}[/tex]
5. [tex]8 \frac{4}{7}-3 \frac{2}{5}-1 \frac{1}{10}[/tex]
6. [tex]6 \frac{25}{27}-4 \frac{4}{9}-1 \frac{1}{3}[/tex]
7. [tex]\frac{6}{7}-\frac{4}{5}[/tex]
8. [tex]\frac{15}{16}-\frac{1}{4}-\frac{1}{2}[/tex]