Roman Numerals Puzzles

A boy in Ancient Rome had a quiz.  He was so absent minded that he made a mistake in each of his equations.

When the teacher checked the quiz, he thought the boy was teasing him, since all of the equations could be corrected by moving just one of elements (I, V, X, L,C, D, M, ---).  See if you can correct the equations.  Forgot how to convert Roman Numerals?  Click here.

Roman Numerals Equation I

Roman Numerals Equation II

Roman Numerals Equation III

Roman Numerals Equation IV

Roman Numerals Equation V

Roman Numerals Equation VI

Answer