Roman number IX to decimal

The Roman number IX is equivalent to the number 9 (nine).

9
IX

IX = 9
The Roman numbering system (Roman numerals) was created in Ancient Rome, and was used throughout the Roman Empire. It consists of seven capital letters of the Latin alphabet: I, V, X, L, C, D and M.
Keywords: How is the number 9 in Romano, How to write 9 in Roman numerals