Last updated on May 26th, 2025
Roman numerals are the 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. 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., to count. 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 CCLXX to represent 270, where C is 100, L is 50, and X is 10. 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.
Rule 1: Addition Method
The addition method is used when the smaller number is placed after the larger number. For example, CCLXX → C + C + L + X + X → 100 + 100 + 50 + 10 + 10 = 270
Rule 2: Repetition Method
To write a large number, there are certain Roman Numerals that can be repeated three times. For example, CCC → 300.
Rule 3: Subtraction Method
If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number. For example, XC → C - X → 100 - 10 = 90
Rule 4: Limitation Rule
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 270 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 270 in Roman numerals using the expansion method.
To write 270 in Roman Numerals, follow the steps,
Step 1: The number is broken down based on the place value: hundreds, tens, ones, etc.
For 270, we write it as 200 + 70
Step 2: Converting the number into Roman Numerals
- 200 in Roman Numerals — CC
- 70 in Roman Numerals — LXX
Step 3: Combining the Roman Numerals together.
Therefore, 270 in Roman Numerals is CC (200) + LXX (70) = CCLXX
When writing a large number into Roman Numerals, we group the number.
To write 270 in Roman Numerals, we group 270 as 200 + 70
- 200 in Roman Numerals — CC
- 70 in Roman Numerals — LXX
So, 270 is written as CCLXX 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 is cataloging ancient artifacts. She has CCLXX coins and wants to divide them equally into X groups. How many coins will each group receive?
Each group will receive XXVII coins.
To determine the number of coins per group, divide the total number of coins by the number of groups.
CCLXX = 270
X = 10
270 / 10 = 27
27 in Roman numerals is XXVII.
Find the sum of CXX and CL.
The sum of CXX and CL is CCLXX.
Sum is the result of adding two numbers.
CXX = 120
CL = 150
120 + 150 = 270
270 in Roman Numerals is CCLXX.
The sum of CXX and CL is CCLXX.
A collector has a set of CCXL and XXX books. How many books does she have in total?
The total number of books is CCLXX.
To find the total number of books, add the two quantities together.
CCXL = 240
XXX = 30
240 + 30 = 270
270 in Roman Numerals can be written as CCLXX.
The total number of books is CCLXX.
What is the difference between CCLXXX and X?
The difference between CCLXXX and X is CCLXX.
The difference of two numbers is the result of subtracting one number from another.
CCLXXX = 280
X = 10
280 - 10 = 270
270 in Roman Numerals can be written as CCLXX
Write the Roman Numeral for 135 + 135 using the expansion method.
The Roman numeral for 135 + 135 is CCLXX.
Step 1: Convert the numbers 135 and 135 into Roman numerals.
135 - CXXXV
Add the numbers together: 135 + 135 = 270
Using the expansion method: 270 = 200 + 70 = CCLXX
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.