$ \begin{array}{r|l} 10 & 2 * 5\\ 1 & \end{array} $
$10 = 2 * 5$

$ \begin{array}{r|l} 100 & 2 * 5\\ 10 & 2 * 5\\ 1 & \end{array} $
$100000 = 2 * 2 * 5 * 5 = 2^2 * 5^2$

$ \begin{array}{r|l} 1000 & 2 * 5\\ 100 & 2 * 5\\ 10 & 2 * 5\\ 1 & \end{array} $
$100000 = 2 * 2 * 2 * 5 * 5 * 5 = 2^3 * 5^3$

$ \begin{array}{r|l} 10000 & 2 * 5\\ 1000 & 2 * 5\\ 100 & 2 * 5\\ 10 & 2 * 5\\ 1 & \end{array} $
$100000 = 2 * 2 * 2 * 2 * 5 * 5 * 5 * 5 = 2^4 * 5^4$

$ \begin{array}{r|l} 100000 & 2 * 5\\ 10000 & 2 * 5\\ 1000 & 2 * 5\\ 100 & 2 * 5\\ 10 & 2 * 5\\ 1 & \end{array} $
$100000 = 2 * 2 * 2 * 2 * 2 * 5 * 5 * 5 * 5 * 5 = 2^5 * 5^5$