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




        0 x 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




       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




        1 x 1 = 1

       11 x 11 = 121

      111 x 111 = 12321

     1111 x 1111 = 1234321

    11111 x 11111 = 123454321

   111111 x 111111 = 12345654321

  1111111 x 1111111 = 1234567654321

 11111111 x 11111111 = 123456787654321

111111111 x 111111111 = 12345678987654321