NUMBER PATTERN USING 1, 2, 8 AND 9

                      9 x 2 = 18

              99 x 2 = 198

            999 x 2 = 1998

          9999 x 2 = 19998

        99999 x 2 = 199998

      999999 x 2 = 1999998

    9999999 x 2 = 19999998

  99999999 x 2 = 199999998

999999999 x 2 = 1999999998