Roman Numerals was a system that was the way that the Roman's would write different numbers. Instead of using numbers.
Basic Roman NumeralsThe Roman numerals with their corresponding HinduArabic numerals are as follows:
One to Twelve Roman Numbers written on a watch.
The following rules are used to write the numbers in the Roman system.
When a Roman numeral is repeated more than once, we add its value each time to get the number.
Examples:
Edurev Tips:
 The same symbol is not repeated more than 3 times together.
 The symbols V, L and D are never repeated.
 There is no symbol for zero in the Roman system.
 Symbols I, X and V are used to write Roman numerals up to 39.
When a smaller Roman numeral is written to the right of a greater Roman numeral, the value of the greater numeral is added to the smaller numeral.
Examples:
When a smaller Roman numeral is written to the left of a greater Roman numeral, it is always subtracted from the value of the greater numeral.
Examples:
Edurev Tips:
 Symbol I can be subtracted only once.
 The symbols V, L and D are never subtracted.
When a smaller Roman numeral is placed between two greater Roman numerals, then its value is subtracted from the value of the greater numeral on its right.
Examples:
Example 1: Write the following in HinduArabic numerals.
(a) XII
(b) VII
(c) XV
(d) XIV
(a) XII = 10 + 1 + 1 = 12
(b) VII = 5 + 1 + 1 = 7
(c) XV = 10 + 5 = 15
(d) XIV = 10 + (5 – 1) = 14
Example 2: Write the following in Roman numerals.
(a) 37
(b) 16
(c) 28
(d) 34
(a) 37 = 30 + 7 = X + X + X + V + I + I = XXXVII
(b) 16 = 10 + 6 = X + V + I = XVI
(c) 28 = 20 + 8 = X + X + V + I + I + I = XXVIII
(d) 34 = 30 + 4 = X + X + X + IV = XXXIV
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