Yes the Roman numeral system evolved from the Etruscan numeral system and the Etruscans once ruled the Romans.

The Hindu-Arabic numeral system which replaced the Roman numeral system.

= 5

The Roman numeral system does not use the letter A.

1. Roman numeral system does not follow the place value system like decimal system. 2. the numerals if written at left or right of a bigger numeral get subtracted or added, but in decimal system this type of confusion is not there. rks_21269@yahoo.com