Last updated on May 26th, 2025
Roman numerals are a way of expressing numbers using symbols. The symbols used are I, V, X, L, C, D, and M. 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. 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 CCCXXXIX to represent 339, where CCC is 300, XXX is 30, and IX is 9. 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, XXX → X + X + X → 10 + 10 + 10 = 30
Rule 2: Repetition Method
To write a large number, certain Roman Numerals can be repeated up to three times. CCC → 300 (C is repeated three times).
Rule 3: Subtraction Method
If a small number is placed before a large number in Roman Numerals, we subtract the smaller number from the large number. For example, IX → X - I → 10 - 1 = 9
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 VV for 10; instead, we use X. The number 8 is written as VIII, not IIIIIIII.
Let’s now learn how to write 339 in Roman Numerals. Follow these methods to write the number in Roman Numerals.
In the expansion method, based on place value, the number is broken down. In this section, we will learn how to write 339 in Roman numerals using the expansion method.
To write 339 in Roman Numerals, follow the steps:
Step 1: Break the number based on place value. Place values include ones, tens, hundreds, etc.
For 339, we write it as 300 + 30 + 9.
Step 2: Convert the numbers into Roman Numerals.
- 300 in Roman Numerals — CCC
- 30 in Roman Numerals — XXX
- 9 in Roman Numerals — IX
Step 3: Combine the Roman Numerals together.
Therefore, 339 in Roman Numerals is CCC (300) + XXX (30) + IX (9) = CCCXXXIX.
When writing a large number into Roman Numerals, we group the number.
To write 339 in Roman Numerals, we group 339 as 300 + 30 + 9.
- 300 in Roman Numerals — CCC
- 30 in Roman Numerals — XXX
- 9 in Roman Numerals — IX
So, 339 is written as CCCXXXIX 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 discovered a set of ancient coins marked with CCCXXXIX and wanted to add them to a collection of LXI coins. What is the total number of coins in the collection?
The total number of coins in the collection is CCCC.
The total number of coins is found by adding the two amounts.
CCCXXXIX = 339
LXI = 61
339 + 61 = 400
400 in Roman Numerals is CCCC.
A library has a shelf capacity of CCCXC books. If a librarian arranges an equal number of books in each of XIII sections, how many books will be placed in each section?
Each section will have XXX books.
To find the number of books per section, divide the total number of books by the number of sections.
CCCXC = 390
XIII = 13
390 / 13 = 30
30 in Roman Numerals is XXX.
An archaeologist found a scroll that describes a battle involving CCXL soldiers. The scroll also mentions that the opposing army had an additional XCIX soldiers. How many soldiers were there in total?
The total number of soldiers was CCCXXXIX.
Add the number of soldiers in each army.
CCXL = 240
XCIX = 99
240 + 99 = 339
339 in Roman Numerals is CCCXXXIX.
A merchant sold XXXVII barrels of wine and had CCCII barrels remaining. How many barrels did the merchant have initially?
The merchant initially had CCCXXXIX barrels.
The initial number of barrels is the sum of sold and remaining barrels.
XXXVII = 37
CCCII = 302
37 + 302 = 339
339 in Roman Numerals is CCCXXXIX.
A mathematician wrote a paper that referenced a formula used CCCXXXIX times and another formula used XX times. Calculate the difference in usage between the two formulas.
The difference in usage is CCCXIX.
Subtract the smaller number from the larger number to find the difference.
CCCXXXIX = 339
XX = 20
339 - 20 = 319
319 in Roman Numerals is CCCXIX.
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.