9. LCM of <u><em>9, 12, and 15</em></u> is <u><em>180</em></u>
12. LCM of <em><u>15, 18, and 30</u></em> is <u><em>90</em></u>
15. LCM of <u><em>40 and 1</em></u> is <u><em>40</em></u>
16: factors of <u><em>24</em></u> : <em>1,2,3,4,6,8,12, and 24</em>
17: factors of <u><em>63</em></u> : <em><u>1, 2, 4, 8, 16, 32 and 64.</u></em>
18: factors of <u><em>50</em></u> : <em><u>1, 2, 5, 10, 25, and 50</u></em>
19: LCM of : <u><em>3 , 2 , 7</em></u><em> </em> is <u><em>42</em></u>
20: LCM of : <u><em>15 , 2</em></u> is <u><em>30</em></u>
21: LCM of : <u><em>45, 30 </em></u><em> </em>is <u><em>90</em></u>
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