We all are familiar with Romans Numerals. Here are some of the basic information and rules related to roman numerals.
Along with the Hindu-Arabic numeral system we use Roman Numerals to written numerals. As the name suggests, it is originated from ancient Rome. However, you will notice that the Romans used a number system which had only seven symbols to represent different numbers.
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
RULES RELATED TO ROMAN NUMERALS:
Rule 1: When a symbol occurs more than once, add its value that many times.
Ex: I = 1; III = 3 Similarly X = 10; XXX = 30
Rule 2:A symbol can be repeated a maximum of three times.
Ex: III = 3 but for 4, we do not write IIII.
Rule 3:If we write a symbol of the smaller value ‘after’ the number with greater value,then it is added to the greater number.
Ex: XI = 10 + 1 = 11 Similarly LX = 50 + 10 = 60
Rule 4: If we write a symbol of the smaller value ‘before’ the number with greater value,then it is subtracted from the greater number.
Ex: IX = 10-1 = 9 Similarly XL = 50-10 = 40
Note:
- There is no symbol for ‘0’ in Roman Numerals.
- The symbols V, L and D are never repeated.
- The symbols V, L and D are never subtracted. Therefore, they will never occur onto the left of a greater number.
- The symbol I can be subtracted from V and X only.
- The symbol X can be subtracted from L and C only
- When a bar is used in the roman numerals it indicates that roman numerals are multiplied by thousand.
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