Question

Rule of roman numeralsrule of Roman numerals ​

Answer 1

There are a few rules for writing numbers with Roman numerals. Repeating a numeral up to three times represents addition of the number. For example, III represents 1 + 1 + 1 = 3. Only I, X, C, and M can be repeated; V, L, and D cannot be, and there is no need to do so.

Answer 2

Answer:

Rule 1: The roman digits I, X and C are repeated upto three times in succession to form the numbers.

(a) We know the value of I = 1, value of X is 10 and value of C is 100.

(b) The value of I, X and C are added as:

I = 1                                                             X = 10

II = 1 + 1 = 2                                                 XX = 10 + 10 = 20

 III = 1 + 1 + 1 = 3                                          XXX = 10 + 10 +10 = 3      

Rule 2: When a digit of lower value is written to the right or after a digit of higher value, the values of all the digits are added. As:

VI = 5 + 1 = 6                                               XVI = 10 + 5 + 1 = 16

Rule 3: When a digit of lower value is written to the left or before a digit of higher value, then the value of the lower digit is subtracted from the value of the digit of higher value. As:

IX = 10 - 1 = 9                                               XIX = 10 + (10 - 1) = 19

Rule 4:V is never written to the left of X.

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