N1D7TNp22

Answer to Problem 22:

1.       Listing the multiples.                  

OR

           Using prime factorizations.       

2.         Listing the multiples.          15 -- 15, 30, 45    LCM = 45

                                                       45 -- 45

OR

            Using prime factorizations.   

OR

            Since 15 goes into 45, the LCM = 45.

NOTE:  Other valid processes are acceptable.