Il numero 11, undici in Italiano, in Inglese si dice eleven.
Il numero ordinale 11° in inglese si dice eleventh.
2: two 3: three 4: four 5: five 6: six 7: seven 8: eight 9: nine 10: ten 12: twelve 13: thirteen 14: fourteen 15: fifteen 16: sixteen 17: seventeen 18: eighteen 19: nineteen 20: twenty