How to solve rational numbers in fraction form

Now Playing:Solve problems with rational numbers in fraction form – Example 1a

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 $\frac{1}{8}$
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. $\frac{5}{8}$ $\left( { - \frac{4}{9}} \right)$
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?