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.
Royal titles, such as Henry I, Henry II, and so on, use Roman Numerals. Have you noticed these symbols (I and II) and wondered what they represented? Those are the Roman Numerals. Originally, people used to count using fingers, sticks, bones, etc. As societies became more complex, a standardized 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 MIX to represent 1009, where M is 1000, I is 1, 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.
The addition method is used when the smaller number is placed after the larger number. For example, XI → X + I → 10 + 1 = 11.
To write a large number, certain Roman Numerals 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 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 1009 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 1009 in Roman numerals using the expansion method. To write 1009 in Roman Numerals, follow the steps:
Step 1: Break the number based on place value, such as ones, tens, hundreds, etc. For 1009, we write it as 1000 + 9.
Step 2: Converting the number into Roman Numerals
Step 3: Combine the Roman Numerals together. Therefore, 1009 in Roman Numeral is M (1000) + IX (9) = MIX.
When writing a large number into Roman Numeral, we group the number. To write 1009 in Roman Numeral, we group 1009 as 1000 + 9.
So, 1009 is written as MIX in Roman Numerals.
Students make mistakes when writing numbers in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and the ways to avoid them.
Calculate the result of multiplying MX and IX.
The product of MX and IX is MMMMMXC.
MX in Roman numerals is 1010, and IX is 9. Multiplying these gives 1010 × 9 = 9090. 9090 in Roman numerals is MMMMMXC.
A library has MCMX books to be equally distributed among XIX book clubs. How many books does each club receive?
Each book club receives CI books.
To find the number of books each club receives, divide the total number of books by the number of clubs: MCMX / XIX. MCMX = 1910 and XIX = 19. Therefore, 1910 / 19 = 101. 101 in Roman numerals is CI.
Find the sum of DCCC and CCIX.
The sum of DCCC and CCIX is MXIX.
DCCC = 800 and CCIX = 209. Adding these gives 800 + 209 = 1009. 1009 in Roman numerals is MXIX.
What is the difference between MM and CMXCI?
The difference between MM and CMXCI is MXIX.
MM = 2000 and CMXCI = 991. Subtracting these gives 2000 - 991 = 1009. 1009 in Roman numerals is MXIX.
Express the Roman Numeral for 509 + 500 using the expansion method.
The Roman numeral for 509 + 500 is MIX.
Step 1: Convert the numbers 509 and 500 into Roman numerals. 509 = DIX and 500 = D Adding them together: 509 + 500 = 1009 Using the expansion method: 1009 = 1000 + 9 = MIX.
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.