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The equivalent of 0.5 or 1/2 as a Roman numeral is S and so therefore the required calculations are as follows:-

SX+SIX = XVIII => (10-0.5)+(10-1.5)= 18

VIIIIS+VIIIS = XVIII => 9.5+8.5 = 18

SX-SIX = I => (10-0.5)-(10-1.5) = 1

VIIIIS-VIIIS = I => 9.5-8.5 = 1

Note that in mathematics -(10-1.5) changes to 1.5-10

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Q: How would you calculate 9.5 plus 8.5 in two different ways and 9.5 minus 8.5 in two different ways but calculating all four calculations completely in Roman numerals with explanations?
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