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Question
When you add the Roman numeral LXXXIX to I, which Hindu-Arabic numeral do you get?
When you add the Roman numeral LXXXIX to I, which Hindu-Arabic numeral do you get?
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Solution
The correct option is D XC
Let us first convert the given Roman numerals into Hindu-Arabic numerals.
We know that X = 10 and L =50.
Also, IX = 10 - 1 = 9.
Thus, LXXXIX = 50 + 10 + 10 + 10 + 9 = 89.
Therefore, LXXXIX + I = 89 + 1 = 90.
But, 90 = 100 - 10 = XC.
Let us first convert the given Roman numerals into Hindu-Arabic numerals.
We know that X = 10 and L =50.
Also, IX = 10 - 1 = 9.
Thus, LXXXIX = 50 + 10 + 10 + 10 + 9 = 89.
Therefore, LXXXIX + I = 89 + 1 = 90.
But, 90 = 100 - 10 = XC.
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