100-90.90909090...=9.090909090...
100-81.81818181...=18.18181818...
100-72.72727272...=27.27272727...
100-63.63636363...=36.36363636...
100-54.54545454...=45.45454545...
100-45.45454545...=54.54545454...
100-36.36363636...=36.36363636...
100-27.27272727...=27.27272727...
100-18.18181818...=81.81818181...

面白くね？9と90は除く