Last updated on May 26th, 2025
Roman numerals are a way of expressing numbers using symbols. The symbols we use are I, V, X, L, C, D, and M. Roman numerals are used in royal titles, book names, sequences, and other areas. Here we will discuss Roman numerals, their rules, and examples.
Royal titles, such as Henry I, Henry II, and so on, often use Roman numerals. Have you noticed these symbols (I and II) and wondered what they represent?
Those are Roman numerals. In ancient times, people counted using fingers, sticks, bones, etc. As life became more complex, a standard form was needed for counting. Ancient Romans developed the Roman numeral system. The symbols used are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000).
In Roman numerals, we use CCXCVII to represent 297. Here, CC is 200, XC is 90, and VII is 7. 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 numeral is placed after a larger numeral, indicating addition. For example, VII → V + II → 5 + 2 = 7.
To write larger numbers, certain Roman numerals can be repeated up to three times. For example, CCC → 300.
If a smaller numeral precedes a larger numeral in Roman numerals, we subtract the smaller numeral from the larger numeral. For example, XC → C - X → 100 - 10 = 90.
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 VV for 10; instead, we use X.
Let's now learn how to write 297 in Roman numerals. Follow these methods to write the number in Roman numerals.
In the expansion method, the number is broken down based on place value. Here, we will learn how to write 297 in Roman numerals using the expansion method.
To write 297 in Roman numerals, follow these steps:
Step 1: Break down the number based on place value. Place values include ones, tens, hundreds, etc.
For 297, we write it as 200 + 90 + 7.
Step 2: Convert the numbers into Roman numerals:
200 in Roman numerals — CC
90 in Roman numerals — XC
7 in Roman numerals — VII
Step 3: Combine the Roman numerals.
Therefore, 297 in Roman numerals is CC + XC + VII = CCXCVII.
When writing a large number in Roman numerals, we group the number.
To write 297 in Roman numerals, we group 297 as 200 + 90 + 7.
200 in Roman numerals — CC
90 in Roman numerals — XC
7 in Roman numerals — VII
So, 297 is written as CCXCVII in Roman numerals.
Students often make mistakes when writing numbers in Roman numerals. To master Roman numerals, we can learn a few common mistakes and ways to avoid them.
A historian wants to divide a collection of DCCCXLVII ancient coins equally among CCXXXVII historians. How many coins will each historian receive?
Each historian will receive III coins.
To find the number of coins each historian receives, divide the total number of coins by the number of historians.
DCCCXLVII = 847
CCXXXVII = 237
Therefore, 847 / 237 ≈ 3.
3 in Roman numerals is III.
Calculate the sum of CLXXV and CXXII.
: The sum of CLXXV and CXXII is CCXCVII.
Adding two numbers together gives their sum.
CLXXV = 175
CXXII = 122
175 + 122 = 297
297 in Roman Numerals is CCXCVII.
What is the product of XXVII and XI?
The product of XXVII and XI is CCXCVII.
Multiplying two numbers gives their product.
XXVII = 27
XI = 11
27 × 11 = 297
297 in Roman Numerals is CCXCVII.
A library has DCCCLXXXI books and is giving away DXCIV books. How many books remain?
The number of books remaining is CCXCVII.
Subtracting the number of books given away from the total gives the remaining number.
DCCCLXXXI = 881
DXCIV = 594
881 - 594 = 297
297 in Roman Numerals is CCXCVII.
Convert the sum of 150 and 147 into Roman numerals using the expansion method.
The Roman numeral for the sum of 150 and 147 is CCXCVII.
Step 1: Convert each number to Roman numerals:
150 = CL
147 = CXLVII
Step 2: Add the numbers together: 150 + 147 = 297
Step 3: Using the expansion method: 297 = 200 + 90 + 7 = CCXCVII
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.