Il numero 51, cinquantuno in Italiano, in Inglese si dice fifty-one.
Il numero ordinale 51° in inglese si dice fifty-first.
42: forty-two 43: forty-three 44: forty-four 45: forty-five 46: forty-six 47: forty-seven 48: forty-eight 49: forty-nine 50: fifty 52: fifty-two 53: fifty-three 54: fifty-four 55: fifty-five 56: fifty-six 57: fifty-seven 58: fifty-eight 59: fifty-nine 60: sixty