Chapter 4.1, Problem 28E

(a)

To determine

To fill: The blanks in the given division ladder,

$\begin{array}{l}3\begin{array}{c}\hfill ▭\\ \hfill \overline{)15}\end{array}\\ ▭\overline{)30}\\ 3\overline{)90}\end{array}$

(b)

To determine

The prime factors from the complete division ladder in part (a), $\begin{array}{l}3\begin{array}{c}\hfill 5\\ \hfill \overline{)15}\end{array}\\ 2\overline{)30}\\ 3\overline{)90}\end{array}$.