Roman number XI to decimal

The Roman number XI is equivalent to the number 11 (eleven).

11
XI

XI = 11
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 11 in Romano, How to write 11 in Roman numerals