Solving problems with rational numbers in fraction form

Lessons

1. Estimate and calculate.
   1. $\frac{4}{5}$- $\frac{5}{6}$
   2. -$\frac{2}{3}$- $\left( { - \frac{5}{6}} \right)$
   3. -$\frac{3}{8}$ + $\left( { - \frac{1}{4}} \right)$
   4. - $\frac{2}{5}$ + $\left( { - \frac{3}{7}} \right)$
   5. 1$\frac{4}{9}$ + $\left( { - 1\frac{2}{3}} \right)$
   6. 1$\frac{1}{4}$ - 2$\frac{1}{8}$
2. 1. -1$\frac{1}{3}$÷ $\left( { - 2\frac{1}{3}} \right)$
   2. -3$\frac{1}{4}$ ÷ 1$\frac{1}{2}$
   3. -$\frac{5}{9}$ ÷ $\frac{7}{{12}}$
   4. -$\frac{1}{6}$× $\left( { - \frac{3}{7}} \right)$
   5. 1$\frac{1}{5}$ ÷ 1$\frac{1}{6}$
   6. $\frac{5}{8}$$\left( { - \frac{4}{9}} \right)$
3. Sam had $45 in his bank account. He first withdrew $\frac{1}{5}$ of his saving. Then he took $\frac{1}{8}$ out from his remaining money. How much money is still left in his bank account?