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. 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 earlier. When life became complex, a standard form was required for counting. 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 MMIX to represent 2009, where MM is 2000, 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.
The addition method is used when the smaller number is placed after the larger number. For example, VI → V + I → 5 + 1 = 6.
To write a large number, there are certain Roman Numerals that can be repeated up to three times. For example, III → 3.
If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large 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. For 8, we write VIII, not IIIIIIII.
Let’s now learn how to write 2009 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 2009 in Roman numerals using the expansion method.
To write 2009 in Roman Numerals, follow the steps:
Step 1: The number is broken based on the place value: thousands, hundreds, tens, and ones.
For 2009, we write it as 2000 + 9.
Step 2: Converting the number into Roman Numerals:
2000 in Roman Numeral — MM
9 in Roman Numeral — IX
Step 3: Combining the Roman Numerals together.
Therefore, 2009 in Roman Numeral is MM (2000) + IX (9) = MMIX.
When writing a large number into Roman Numerals, we group the number.
To write 2009 in Roman Numeral, we group 2009 as 2000 + 9.
2000 in Roman Numeral — MM
9 in Roman Numeral — IX
So, 2009 is written as MMIX 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.
Calculate the product of MMIX and II.
The product of MMIX and II is MMMXVIII
In numbers, MMIX is 2009 and II is 2.
The product of MMIX and II is 2009 × 2 = 4018.
4018 in Roman Numerals can be written as MMMXVIII.
A historian has MMMCMXLV ancient coins and wants to distribute them equally among XV heirs. How many coins will each heir receive?
Each heir will receive CCLXIII coins.
To find the number of coins each heir gets, divide the total number of coins by the number of heirs.
MMMCMXLV = 3945
XV = 15
Therefore, MMMCMXLV / XV = 3945 / 15 = 263.
263 in Roman numerals can be written as CCLXIII.
Determine the sum of MDCC and MMIX.
The sum of MDCC and MMIX is MMMDCIX
Sum is the result of adding two numbers.
MDCC = 1700
MMIX = 2009
1700 + 2009 = 3709
3709 in Roman Numerals is MMMDCIX.
The sum of MDCC and MMIX is MMMDCIX.
What is the difference between MMXII and MMIX?
The difference between MMXII and MMIX is III.
The difference of two numbers is the value we get when subtracting one number from the other.
MMXII = 2012
MMIX = 2009
2012 - 2009 = 3
3 in Roman Numerals can be written as III.
Write the Roman Numeral for 2009 + 46 using the expansion method.
The Roman numeral for 2009 + 46 is MMLV.
Step 1: Convert the numbers 2009 and 46 into Roman numerals.
2009 - MMIX
46 - XLVI
Add the numbers together: 2009 + 46 = 2055
Using the expansion method: 2055 = 2000 + 50 + 5 = MMLV.
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.