Compare XXII & 12 (using >, <, =)
The Roman numerals are represented by the following letters:
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
If a numeral is followed by another numeral of lower denomination, the two are added together;
if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.