Category : 4th Class
Roman Numerals
Introduction
The numerals we use is commonly known as Indo-Arabic Numerals. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ______ etc., are example of indo -Arabic numerals in ancient time Romans developed a system of numerations (numbering) which is known as Roman Numerals. I, II, III, IV, V, VI, VII, VIII, IX, _______ etc. are example of Roman Numerals.
Roman numerals are formed by using the following symbols:
Roman Numerals |
Hindu-Arabic Numeral |
I |
1 |
V |
5 |
X |
10 |
L |
50 |
C |
100 |
O |
500 |
M |
1000 |
Rules to write Roman Numerals
Rule 1: If a symbol is repeated in a Roman Numeral, the value of the Numeral is obtained by adding the value of the symbols.
Find the Hindu-arabic numeral for II and XX.
Solution:
\[II=1+1=2,\]
\[XX=10+10=20\]
Find the Hindu-arabic numeral for XXX.
Solution:
\[XXX=10+10+10=30\]
Rule 2: In a Roman numeral, if a symbol at the left have greater value than the symbol at the right, then add the values of these two symbols.
Find the value of the roman numerals CL and LX.
Solution:
\[CL=100+50=150\]
\[LX=50+10=60\]
Find the value of the roman numeral MC.
Solution:
\[MC=1000+100=1100\]
Rule 3: In a Roman numeral, if a symbol at the right have greater value than the symbol at the left, difference of their value is the resulting value.
Find the value of roman numerals CM and XC.
Solution:
\[CM=1000-100=900\]
\[XC=100-10=90\]
Find the value of roman numeral CD.
Solution:
\[CD=500-100=400\]
Rule 4: The symbols I, X, C and M can be repeated in a roman numeral whereas V, L and D can not be repeated.
Write the correct numeral for roman numeral DCC.
Solution:
\[DCC=500+100+100\]\[=700\]
Why the roman numeral MLL is not valid?
Solution:
In the numeral the symbol L has been repeated twice. Therefore, MLL is not a valid roman numeral.
Rule 5: When a Roman symbol of smaller value is placed between two symbols of greater value, its value is subtracted from the value of the symbol to its right.
Find the value of the roman numeral LIX.
Solution:
\[LIX=50+\left( 10-1 \right)=59\]
Find the value of the roman numeral XIV.
Solution:
\[XIV=10+\left( 5-1 \right)=14\]
Note: No symbols can be repeated more than three times
You need to login to perform this action.
You will be redirected in
3 sec