XC
90 = XC
in words ninety in numbers 90
XCVIII is 98 in Roman numerals
Roman numerals for 201 = CCI
DXXVII is the answer.
MMX
Roman numerals are a system for writing numbers, not words. the Roman numeral for 4 is IV.
MCLXX
LVI = 56
Undecim.
The roman numerals don't have a way to write 0, negative numbers, or fractions.