What are the roman numerals from 1-5?

Answer 1

1 - I

2 - II

3 - III

4 - IV

5 - V

(10 - X, 50 - L, 100 - C, 500 - D, 1000 - M)

and remember, you can't have 3 of the same character in a row, and, if you put the lesser before the greater (eg. CM - 900), you must deduct the lesser from the greater