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When In Rome Do As The Romans Do!

Addition and Subtraction of Roman Numerals

AB
V + I=Six
II + III =Five
V + V =Ten
III + IV =Seven
X + V =Fifteen
IV + IV =Eight
V + IV =Nine
I + II =Three
V+ VI =Eleven
VII + II =Nine
II - I =One
IV - II =Two
X - V =Five
VI - II =Four
X - III =Seven
IX - III =Six
L - X =Forty
VII - IV =Three
XX - X =Ten
X - II =Eight


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