# What does X represent in Roman numerals?

X is the number 10 in Roman numerals.

### Is the year 1999 converted into roman numerals as mcmxcix correct if not can you explain why?

It is incorrect because the Roman numerals that represent 1999 are MDCCCCLXXXXVIIII which, when I is placed to the left and right hand sides of them, can be simplified to IMM (2000-1). The numerals MCMXCIX are in fact a set of numerals that represent: M-C+M-X+C-I+X (1000-100+1000-10+100-1+10) which, when cancelled down, equals IMM. Likewise, the numerals M+CM+XC+X are a set of numerals that represent: M-C+M-X+C+X which, when cancelled down, equals MM. Working out Roman numerals is…