Topic Details (Notes format)

How to Convert Roman Numerals to Arabic Numerals

Subject: Mathematics

Book: Maths Mastery

Roman numerals, often seen in old clocks or historical documents, use letters like I, V, X, L, C, D, M to represent numeric values. For example, IX means 9 (10 – 1), and XVI means 16 (10 + 5 + 1). Generally, if a smaller numeral precedes a larger one, you subtract; otherwise, you add. So MCMLXXXIV is 1984. By learning these rules—like I=1, V=5, X=10, L=50, C=100, D=500, M=1000—you can decode centuries-old texts, interpret monument inscriptions, or even style modern events. Converting Roman numerals fosters a deeper appreciation of number systems and historical contexts.

Practice Questions

What is the length of the diagonal of a square with a side length of 7 cm?

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What is the sum of the first 20 odd numbers?

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If a rectangle has a length of 10 cm and a width of 6 cm, what is its perimeter?

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What is the area of an equilateral triangle with side length 10 cm?

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A train 150 m long passes a pole in 15 seconds. What is its speed?

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If the average of five consecutive odd numbers is 25, what is the largest number?

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If x² - 9x + 18 = 0, what are the roots of the equation?

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What is the area of a sector of a circle with radius 14 cm and central angle 90°?

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A car travels 240 km in 4 hours. What is its average speed?

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A man invests Rs. 5000 at 5% per annum simple interest. What is the total amount after 3 years?

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