KPK dan FPB dari 42, 84 dan 98

          42                         84                         98
           ^                            ^                           ^
         2   21                    2   42                    2  49
               ^                            ^                          ^
             3   7                       2   21                  7    7
                                                 ^
                                               3   7

KPK = 2² x 7² x 3
        = 588

FPB = 2 x 7
        = 14