Last updated on May 26th, 2025
Roman numerals are a way of expressing numbers using specific 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 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 CCCXIII to represent 313, where C is 100, X is 10, and I is 1. 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 the smaller number is placed after the larger number. For example, CCCXIII → C + C + C + X + I + I + I → 100 + 100 + 100 + 10 + 1 + 1 + 1 = 313.
To write a large number, certain Roman Numerals can be repeated up to three times. For example, CCC → 100 + 100 + 100 = 300.
If a smaller number precedes a larger number in Roman Numerals, we subtract the smaller number from the larger number. For example, IX → X - I → 10 - 1 = 9.
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, and for 8, we write VIII, not IIIIIIII.
Let’s now learn how to write 313 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 313 in Roman numerals using the expansion method.
To write 313 in Roman Numerals, follow these steps:
Step 1: The number is broken based on the place value. Place values include ones, tens, hundreds, etc.
For 313, we write it as 300 + 10 + 3.
Step 2: Converting the number into Roman Numerals:
300 in Roman Numerals — CCC
10 in Roman Numerals — X
3 in Roman Numerals — III
Step 3: Combining the Roman Numerals together
Therefore, 313 in Roman Numerals is CCC (300) + X (10) + III (3) = CCCXIII.
When writing a large number in Roman Numerals, we group the number. To write 313 in Roman Numerals, we group 313 as 300 + 10 + 3.
300 in Roman Numerals — CCC
10 in Roman Numerals — X
3 in Roman Numerals — III
So, 313 is written as CCCXIII 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 ways to avoid them.
A historian decodes an ancient tablet that mentions the construction of CCCXIII aqueducts over CCCIX years. How many more years than aqueducts were mentioned on the tablet?
The difference is IV
To find how many more years than aqueducts were mentioned, subtract the number of aqueducts from the number of years.
CCCXIII = 313
CCCIX = 309
313 - 309 = 4
4 in Roman Numerals is IV.
Calculate the total population of two ancient cities if one city had a population of CLVI and another CLVII.
The total population is CCCXIII
The sum of the populations of the two cities is given by:
CLVI = 156
CLVII = 157
156 + 157 = 313
313 in Roman Numerals is CCCXIII.
A museum has CCCXIII artifacts to be displayed in XIII galleries. How many artifacts will each gallery display equally?
Each gallery will display XXIV artifacts
To find the number of artifacts per gallery, divide the total number of artifacts by the number of galleries.
CCCXIII = 313
XIII = 13
313 ÷ 13 = 24
24 in Roman Numerals is XXIV.
Convert the sum of CCXLII and LXXI to Roman Numerals.
The sum is CCCXIII
Add the two numbers to find their sum.
CCXLII = 242
LXXI = 71
242 + 71 = 313
313 in Roman Numerals is CCCXIII.
What is the difference between CCCXIII and CCIV?
The difference is CIX
Subtract the smaller number from the larger number to find the difference.
CCCXIII = 313
CCIV = 204
313 - 204 = 109
109 in Roman Numerals is CIX.
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.