On converting between Arabic and Roman Numbers: DCCVI IN ROMAN NUMERALS is 706. DCC=700 and VI=6.
MDCCXCIII (M=1000, DCC=700, XC=90, III=3)
roman numarals are v,i ,x,c and some other stuff with represent numbers
XII
L
Your answer is XXI
CCCLXII
1 = I
XXXIX
538
XII
CXXVI