Show that the recurring decimal $\displaystyle 0.\overline{69}$ can be written as the fraction $\displaystyle \frac{23}{33}$

$\displaystyle \mbox{I showed that}\frac{2}{3}=0.6\mbox{and that}\frac{3}{33}=0.09\mbox{is this a correct explanation?}$

Also can anyone direct me to any good sources to learn how to create cumulative frequency columns when faced with inequalities adn how to draw box plots.