They're numbers. Hence the term 'numeral'.
You is a word, not a letter. If you mean the letter U, in Roman numerals it is written V and stands for 5.
Unfortunately, the roman numeral 'Z' does not exist. ):
V is the Roman numeral equivalent to 5
It is: 5 = V as a Roman numeral
This is not a valid roman numeral!
LXXVI is the Roman numeral for 76.
The Roman numeral of DXIII is equivalent to 513
You mean Roman Numeral? It is XVI
if you mean what number the letter change in. well the answer is 100. 100 is D
It is the Roman Numeral for the number 6. It is the Roman Numeral for the number 6.
The Roman numeral CCLXVI represents the number 266
The Roman numeral CXXXVI represents the number 136