3 * 37 = 111
 6 * 37 = 222
 9 * 37 = 333
12 * 37 = 444
15 * 37 = 555
18 * 37 = 666
21 * 37 = 777
24 * 37 = 888
27 * 37 = 999

111.111.111  *  111.111.111 = 12.345.678.987.654.321

                            1 * 9 + 2 = 11                               
                             12 * 9 + 3 = 111                                
                           123 * 9 + 4 = 1111                              
                          1234 * 9 + 5 = 11111                             
                         12345 * 9 + 6 = 111111                            
                        123456 * 9 + 7 = 1111111                           
                       1234567 * 9 + 8 = 11111111                          
                      12345678 * 9 + 9 = 111111111                         

  1 * 8 + 1 = 9       

                     12 * 8 + 2 = 98                          

                    123 * 8 + 3 = 987                         

                   1234 * 8 + 4 = 9876                        

                  12345 * 8 + 5 = 98765                       

                 123456 * 8 + 6 = 987654                      

                1234567 * 8 + 7 = 9876543                     

               12345678 * 8 + 8 = 98765432                    

              123456789 * 8 + 9 = 987654321