Il numero 81, ottantuno in Italiano, in Inglese si dice eighty-one.
Il numero ordinale 81° in inglese si dice eighty-first.
72: seventy-two
73: seventy-three
74: seventy-four
75: seventy-five
76: seventy-six
77: seventy-seven
78: seventy-eight
79: seventy-nine
80: eighty
82: eighty-two
83: eighty-three
84: eighty-four
85: eighty-five
86: eighty-six
87: eighty-seven
88: eighty-eight
89: eighty-nine
90: ninety