Rule 1 – Repetition of a Roman Numeral means addition.
- Only letters I, X, C, M can be repeated.
- No letter can be repeated more than 3 times.
- Letter V, L, D are never repeated.
Rule 2 – When a smaller numeral is placed on the left of the larger numeral, it means Subtraction.
- I can be subtracted from V and X only.
- X can be subtracted from L and C only.
- C can be subtracted from D and M only.
Conversion of Hindu Arabic Numerals to Roman Numerals.
Question 1
Express 4 in Roman Numeral.
Explanation
Step I : Express the number in expanded form.
4 = 5 – 1
Step II : Convert Expanded form of number in Roman Numeral.
5 – 1 = (V) – (I) = IV
Hence, 4 would be represented as IV
Question 2
Express 12 in Roman Numeral.
Explanation
Step I : Express the number in Expanded form.
12 = 10 + 1 + 1
Step II : Convert Expanded form of number in Roman Numeral.
10 + 1 + 1 = (X) + (I) + (I)= XII
Hence, 12 would be represented as XII
Question 3
Express 48 in Roman Numeral.
Explanation
Step I : Express the number in Expanded form.
48 = 40 + 5 + 3
= (50 – 10) + 5 + 3
Step II : Convert Expanded form of number in Roman Numeral.
(50 – 10) + 5 + 3 = (L – X) + (V) + (III)= XLVIII
Hence, 48 would be represented as XLVIII
Question 4
Express 95 in Roman Numeral.
Explanation
Step I : Express the number in Expanded form.
95 = 90 + 5
= (100 – 10) + 5
Step II : Convert Expanded form of number in Roman Numeral.
(100 – 10) + 5 = (C – X) + V = XCV
Hence, 95 would be represented as XCV
Conversion of Roman Numerals to Hindu Arabic Numerals.
Question 1
Express VI in Hindu Arabic Numeral.
Explanation
VI = V + I
= 5 + 1
= 6
Hence, VI can be represented as 6 in Hindu Arabic Numeral.
Question 2
Express XVII in Hindu Arabic Numeral.
Explanation
XVII = X + V + I + I
= 10 + 5 + 1 + 1
= 17
Hence, XVII can be represented as 17 in Hindu Arabic Numeral.
Question 3
Express XIV in Hindu Arabic Numeral.
Explanation
XIV = X + IV
= 10 + 4
= 14
Hence, Roman Numeral XIV can be represented as 14 in Hindu Arabic Numeral.
Question 4
Express XXVIII in Hindu Arabic Numeral.
Explanation
XXVIII = X + X + V + I + I + I
= 10 + 10 + 5 + 1 + 1 + 1
= 28
Hence, XXVIII can be represented as 28 in Hindu Arabic Numeral.
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