Last updated on May 26th, 2025
Roman numerals are a way of expressing numbers using symbols. I, V, X, L, C, D, and M are the symbols we use. Roman Numerals are used in royal titles, book names, sequences, and so on. Here we will be discussing Roman Numerals, rules, and examples.
The royal titles, such as Henry I, Henry II, and so on, use Roman Numerals. Have you noticed the names and wondered what these symbols (I and II) represented?
Those are the Roman Numerals. Earlier, people used to count using fingers, sticks, bones, etc. When life became complex, a standard form was required to count. Ancient Romans used the Roman Numeral system to count. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols we use to count.
In Roman Numerals, we use CL to represent 150, where C is 100 and L is 50. Let’s learn more about Roman numerals and how we write them.
There are certain basic rules to write a number in Roman Numerals. In this section, let’s discuss some basic rules that need to be remembered when writing a number in Roman numerals.
The addition method is used when a smaller number is placed after a larger number. For example, CL → C + L → 100 + 50 = 150
To write a large number, there are certain Roman Numerals that can be repeated up to three times. For example, CCC → 300.
If a small number is followed by a larger number in Roman Numerals, we subtract the smaller number from the larger number. For example, XL → L - X → 50 - 10 = 40
The symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we won't write LL for 100; instead, we use C.
Let’s now learn how to write 150 in Roman Numerals. Follow these methods to write the number in Roman Numerals.
In the expansion method, based on the place value, the number is broken down. In this section, we will learn how to write 150 in Roman numerals using the expansion method.
To write 150 in Roman Numerals, follow the steps:
Step 1: The number is broken down based on the place value—ones, tens, hundreds, etc.
For 150, we write it as 100 + 50.
Step 2: Converting the number into Roman Numerals:
100 in Roman Numerals — C
50 in Roman Numerals — L
Step 3: Combining them in Roman Numerals:
Therefore, 150 in Roman Numerals is C (100) + L (50) = CL.
When writing a large number into Roman Numerals, we group the number. To write 150 in Roman Numerals, we group 150 as 100 + 50:
100 in Roman Numerals — C
50 in Roman Numerals — L
So, 150 is written as CL in Roman Numerals.
Students make mistakes when writing a number in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and the ways to avoid them.
A historian discovers CL ancient coins and wants to distribute them equally among V archaeologists. How many coins will each archaeologist receive?
Each archaeologist will receive XXX coins.
To find the number of coins each archaeologist receives, divide the total number of coins by the number of archaeologists.
That is CL / V
CL = 150
V = 5
Therefore, CL / V = 150 / 5 = 30.
30 in Roman numerals can be written as XXX.
Calculate the difference between CCL and CL.
The difference between CCL and CL is C.
The difference of two numbers is the value obtained when subtracting one number from the other.
CCL = 250
CL = 150
250 - 150 = 100
100 in Roman Numerals can be written as C.
An ancient scroll mentions that a festival lasted for the sum of L and C days. Find the total number of days in Roman numerals.
The total number of days is CL.
Sum is the result of adding two numbers.
L = 50
C = 100
50 + 100 = 150
150 in Roman Numerals is CL.
Thus, the festival lasted for CL days.
A scholar is researching a manuscript that states a tower was built in the year CI and was renovated after XLIX years. In which year was the tower renovated?
The tower was renovated in the year CL.
To find the year of renovation, add the renovation period to the original construction year.
CI = 101
XLIX = 49
101 + 49 = 150
150 in Roman Numerals is CL.
Write the Roman Numeral for 75 + 75 using the expansion method.
The Roman numeral for 75 + 75 is CL.
Step 1: First convert the numbers 75 into Roman numerals.
75 - LXXV
Add the numbers together: 75 + 75 = 150
Using expansion method: 150 = 100 + 50 = CL
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
: She loves to read number jokes and games.