1. Roman Digits vs. Decimal Places
10^5 10^4 10^3 10^2 10^1 10^0
C X m c x i
CC XX mm cc xx ii
CCC XXX mmm ccc xxx iii
CD XL mV cd xl iv
D L V d l v
DC LX Vm dc lx vi
DCC LXX Vmm dcc lxx vii
DCCC LXXX Vmmm dccc lxxx viii
CM XC mX cm xc ix
Example:
DC L mV ccc xx i = 654,321