You can put this solution on YOUR website! I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
A bar above a Roman numeral meant a thousand times the number, e.g., a bar above an X would mean ten thousand.
A smaller symbol in front of a larger means to subtract, e.g., XL means 10 from 50 or 40.