I,II,III,IV,V,VI
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It was once VIIII and later simplified to IX (10-1)
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 ones. → 2014 = 1000 + 1000 + 10 + (-1 + 5) = MMXIV
I II III IV V VI VII VIII IX X
1.5 = IS in Roman numerals because 1= I and 0.5 = S
In todays notation of Roman numerals: VIII-I-MCMXLVII