K A Stroud Engineering Mathematics 6th ed p.61 frame 133

Change $\displaystyle 0.528_{10}$ to octal(base 8) form

Method: every time only multiply the decimal part by 8

$\displaystyle \begin{array}{r}0.526\\\times8\\4.208\\\times8\\1. 664\\\times8\\5.312\\\times8\\2.496\\... goes\ on\end{array}$

answer: 0.4152