[tex] \bf \begin{array}{l|lll}
3^4&81\\\\
3^3&27\leftarrow 81\cdot \frac{1}{3}\\\\
3^2&9\leftarrow 27\cdot \frac{1}{3}\\\\
3^1&3\leftarrow 9\cdot \frac{1}{3}
\end{array}\qquad \qquad \qquad \qquad
\begin{array}{l|lll}
2^4&16\\\\
2^3&8\leftarrow 16\cdot \frac{1}{2}\\\\
2^2&4\leftarrow 8\cdot \frac{1}{2}\\\\
2^1&2\leftarrow 4\cdot \frac{1}{2}\\\\
2^0&1\leftarrow 2\cdot \frac{1}{2}\\\\
2^{-1}&\frac{1}{2}\leftarrow 1\cdot \frac{1}{2}
\end{array} [/tex]
notice the pattern, the next number, for the 3's table is just the current number times 1/3. The next number for the 2's table is just the current number times 1/2.
