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Q1. A book has its 15th chapter marked in Roman numerals. What is it written as?
(a) XV
(b) XII
(c) XVIII
(d) VIX
Ans: (a) XV
15 = 10 + 5 = X + V = XV
Q2. A clock shows the time with Roman numeral XII. What hour is it?
(a) 10
(b) 11
(c) 12
(d) 13
Ans: (c) 12
XII = X + I + I = 10 + 1 + 1 = 12
Q3. A movie title ends with IV. What number does this represent?
(a) 4
(b) 5
(c) 6
(d) 3
Ans: (a) 4
IV = V - I = 5 - 1 = 4 (Subtraction rule: smaller number before larger one means subtract).
Q4. A building has 50 floors, and the top floor is marked in Roman numerals. What is it written as?
(a) XL
(b) L
(c) LX
(d) XC
Ans: (b) L
50 = L (Directly represented by the Roman numeral L).
Q5. A video game level is marked as XXV. What level number is this?
(a) 20
(b) 22
(c) 25
(d) 28
Ans: (c) 25
XXV = X + X + V = 10 + 10 + 5 = 25 (Addition rule applies).
Q6. A school event is the 9th in a series, marked in Roman numerals. How is it written?
(a) IX
(b) XI
(c) VII
(d) VIII
Ans: (a) IX
9 = 10 - 1 = X - I = IX (Subtraction rule applies).
Q7. A historical monument is labeled CD in Roman numerals. What year does this represent?
(a) 400
(b) 500
(c) 600
(d) 450
Ans: (a) 400
CD = D - C = 500 - 100 = 400 (Subtraction rule applies).
Q8. A book’s page number is written as XXX in Roman numerals. What page is it?
(a) 20
(b) 30
(c) 40
(d) 33
Ans: (b) 30
XXX = X + X + X = 10 + 10 + 10 = 30 (Repetition rule: add the values, max 3 times).
Q9. A sports tournament is in its 45th year, marked in Roman numerals. How is it written?
(a) XLV
(b) XLIV
(c) LV
(d) XLI
Ans: (a) XLV
45 = 40 + 5 = (50 - 10) + 5 = XL + V = XLV (Subtraction for 40, then addition for 5).
Q10. A clock face shows IX. How many minutes past the hour is it if each numeral represents 5 minutes?
(a) 40 minutes
(b) 45 minutes
(c) 50 minutes
(d) 35 minutes
Ans: (b) 45 minutes
IX = 9 (5 - 1 = 4, but here it’s 9 directly). If each numeral is 5 minutes, 9 × 5 = 45 minutes.
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FAQs on Roman Numerals - Math Olympiad for Class 5
| 1. What are Roman numerals and how are they different from regular numbers? |  |
| 2. How do you convert a regular number to Roman numerals? | |
Ans.To convert a regular number to Roman numerals, break the number down into its constituent parts based on place value (thousands, hundreds, tens, and units). Then, substitute each part with its corresponding Roman numeral. For example, to convert the number 1987, you would break it down to 1000 (M), 900 (CM), 80 (LXXX), and 7 (VII), resulting in the Roman numeral MCMLXXXVII.
| 3. Can you provide examples of Roman numerals for numbers 1 to 10? | |
Ans.Yes, the Roman numerals for numbers 1 to 10 are as follows: 1 is I, 2 is II, 3 is III, 4 is IV, 5 is V, 6 is VI, 7 is VII, 8 is VIII, 9 is IX, and 10 is X.
| 4. What are the basic rules for writing Roman numerals? | |
Ans.The basic rules for writing Roman numerals include:
1. Use letters I, V, X, L, C, D, and M.
2. A letter can be repeated to add value (e.g., III = 3).
3. When a smaller numeral appears before a larger one, it is subtracted (e.g., IV = 4).
4. When a smaller numeral appears after a larger one, it is added (e.g., VI = 6).
5. Never use the same numeral more than three times in a row.
| 5. Are there any limitations to Roman numerals? | |
Ans.Yes, Roman numerals have limitations, such as not having a symbol for zero and being cumbersome for very large numbers. They are primarily used for decorative purposes, in clocks, and for certain events (like the Super Bowl) rather than for mathematical calculations. Additionally, they do not easily accommodate fractions or decimals.
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