1. The problem involves understanding the Roman numeral III and the middle V being V prime (V'). 2. Roman numeral III represents the number 3. 3. The middle V in III is not standard since III is three I's, but if we consider V' as a prime notation, it might represent a derivative or a special symbol. 4. If V' means the derivative of V in a mathematical context, and V represents a variable or function, then V' is its derivative. 5. Since the problem is ambiguous, let's clarify: III is 3, V is 5, and V' could mean the derivative of 5, which is 0 since 5 is constant. 6. Therefore, the middle V' in III is not standard, but if interpreted as derivative, V' = 0. 7. Final answer: The Roman numeral III is 3, and the middle V' interpreted as derivative equals 0.