有趣的算術!
  Basic one:

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

  Nice one:

 
111,111,111  x  111,111,111 =  
  12,345,678,987,654,321

  Trapeze:

                             0x 9 + 1 = 1
                           
1 x 9 + 2 = 11
                          12 x 9 + 3 = 111 
                        123 x 9 + 4 = 1111
                      1234 x 9 + 5 = 11111
                    12345 x 9 + 6 = 111111
                  123456 x 9 + 7 = 1111111
                1234567 x 9 + 8 = 11111111 
              12345678 x 9 + 9 = 111111111
 
            123456789 x 9+10 = 1111111111

   another Trapeze:


                      
      1 x 8 + 1 = 9
                          12 x 8 + 2 = 98
                        123 x 8 + 3 = 987 
                      1234 x 8 + 4 = 9876
                    12345 x 8 + 5 = 98765
                  123456 x 8 + 6 = 987654
                1234567 x 8 + 7 = 9876543
              12345678 x 8 + 8 = 98765432 
            123456789 x 8 + 9 = 987654321

   and another one:

                               
   0x 9 + 8 = 8
                                 9 x 9 + 7 =
88
                               98 x 9 + 6 =
888 
                             987 x 9 + 5 =
8888
                           9876 x 9 + 4 =
88888
                         98765 x 9 + 3 =
888888
                       987654 x 9 + 2 =
8888888 
                     9876543 x 9 + 1 =
88888888
                   98765432 x 9 + 0 =
888888888
                 987654321 x 9 -  1 =
8888888888
               9876543210 x 9 -  2 =
88888888888

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