What is 7.2 as a Roman Numeral?

Answer 1

The Romans used a duodecimal (base-12) system for fractions. You cannot notate 1/5 using duodecimal. The following notations are used for the 11 possible fractions used by the Romans using a series of dots and the letter S (for semis, or half):

1/12 = ●

1/6 = ●●

1/4 = ●●●

1/3 = ●●●●

5/12 = ●●●●●

1/2 = S

7/12 = S●

2/3 = S●●

3/4 = S●●●

5/6 = S●●●●

11/12 = S●●●●●