In today's modern notation of them they are IV, XXIX and LXXXI respectively
LXXXI is 81
81
81
Lxxxi is a Roman numeral that represents the number 81.
It is: 81 = LXXXI
The Roman numeral LXXXI represents the number 8150 + 30 + 1 = 81
XII-XXXI-LXXXI
81/4 inches.
L is fifty. X is ten. I is one. 50 + 10 + 10 + 10 + 1 is 81, so LXXXI is the answer.
8 = VIII 11 = XI 1900 = MCM 81 = LXXXI so 8.11.1981 = VIII.XI.MCMLXXXI
81 (50+10+10+10+1 = 81)
81 [lots] of 29 make 2349.