Solve the following problems, show work:

1. $\frac{3}{4} \times \frac{2}{5}$
   

1. $8 \times 1 \frac{3}{4}$
   

1. $2 \frac{7}{8} \times 3 \frac{1}{4}$
   

1. $\frac{5}{6} \div \frac{2}{3}$