9=9

99, 9+9=18, 1+8=9

9+9=18, 1+8=9

9x9=81, 8+1=9

81+18=99, 9+9=18, 1+8=9

99+18=117, 1+1+7=9

99+81=180, 1+8+0=9

81x18=1,458, 1+4+5+8=18, 1+8=9

99x18=1,782, 1+7+8+2=18, 1+8=9

99x81=8,019, 8+0+1+9=18, 1+8=9

99+99=198, 1+9+8=18, 1+8=9

99x99=9,801, 9+8+0+1=18, 1+8=9

99+18+81=198, 1+9+8=18, 1+8=9

99x18x81=14,4342, 1+4+4+3+4+2=18, 1+8=9

144342x9=1,299,078, 1+2+9+9+0+7+8=36, 3+6=9

144324

Let's hope this pattern can be used for the good of mankind....