Answer:
The LCM of 9, 12, and 24, is <em>72.  </em>
Step-by-step explanation:
To find the answer you must figure out the factors of <em>each number</em>, and see which factor has the <em>same number.</em>  
<u><em>Factors of 9: </em></u>         <u><em>Factors of 12:</em></u><em>        </em><u><em>Factors of 24: </em></u>
      <em>  9                            12                          24</em>
<em>        18                          24                          48</em>
<em>        27                          36                         72</em>
<em>        36                          48</em>
<em>        45                          60</em>
<em>        54                          72</em>
<em>        63</em>
<em>        72</em>
When we look at all these factors, none of them have the same number <em>except 72.</em>  Since <em>all</em> of these factors have <em>72 in them</em>, this is the<em> </em>LCM of 9, 12, and 24.