M = 1000, D = 500, CC = 200 and XX = 20 so MDCCXX = 1720.
MDCCXX = 1000+500+100+100+10+10 = 1720
In today's terms it is 19
Roman numerals.... 1 = I 2 = II 3 = III 4 = IV (or IIII on old clocks, watches and sundials) 5 = V 6 = VI 7 = VII 8 = VIII 9 = IX 10 = X 20 = XX 30 = XXX 40 = XL 50 = L 60 = LX 70 =...
The Roman numeral XVIII represents the number 18