Question 975880
<pre>
Make a factor tree.  Break an integer into the product of two
smaller integers.  Stop when you can't do that anymore. Then
put all the "dead ends" together: 

Break 72 into 9×8
Break 9 into 3×3 and 8 into 2×4
Break 4 into 2×2.

                         72
                       /    \
                      9   ×  8
                     / \    / \ 
                    3 × 3  2 × 4
                              / \  
                             2 × 2

72 = 3×3×2×2×2 = 3<sup>2</sup>×2<sup>3</sup>

Edwin</pre>