Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger one.
→ 540 = 500 + (-10 + 50) = DXL.
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243 = CCXLIII two hundred and forty three
In today's terms 2,359,245 = (MMCCCLIX)CCXLV But during the Roman era it would have probably been written out differently in the way that we write out Roman numerals today.
C is 100.
I to CC
In Roman Numerals, 100 was C.