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, use Roman Numerals. 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. 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 DCXXIX to represent 629, where D is 500, C is 100, X is 10, 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, DCXX → D + C + X + X → 500 + 100 + 10 + 10 = 620
To write a large number, there are certain Roman Numerals that can be repeated three times. For example, XXX → 30.
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, and for 8, we write VIII, not IIIIIIII.
Let’s now learn how to write 629 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 629 in Roman numerals using the expansion method. To write 629 in Roman Numerals, follow these steps:
Step 1: Break the number based on place value, which includes ones, tens, hundreds, etc. For 629, we write it as 500 + 100 + 20 + 9.
Step 2: Converting the number into Roman Numerals
500 in Roman Numerals - D
100 in Roman Numerals - C
20 in Roman Numerals - XX
9 in Roman Numerals - IX
Step 3: Combine the Roman Numerals together. Therefore, 629 in Roman Numerals is D (500) + C (100) + XX (20) + IX (9) = DCXXIX
When writing a large number into Roman Numerals, we group the numbers. To write 629 in Roman Numerals, we group 629 as 500 + 100 + 20 + 9.
500 in Roman Numerals - D
100 in Roman Numerals - C
20 in Roman Numerals - XX
9 in Roman Numerals - IX
So, 629 is written as DCXXIX 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.
Find the product of DCXXIX and II.
The product of DCXXIX and II is MCCCLVIII
In numbers, DCXXIX is 629 and II is 2. The product of DCXXIX and II is 629 × 2 = 1258. 1258 in Roman Numerals can be written as MCCCLVIII.
A historian needs to distribute MCCCLVIII artifacts evenly into DCXXIX boxes. How many artifacts will each box contain?
Each box will contain II artifacts.
To find the number of artifacts in each box, we divide the total number of artifacts by the number of boxes. That is MCCCLVIII / DCXXIX.
MCCCLVIII = 1358
DCXXIX = 629
Therefore, MCCCLVIII / DCXXIX = 1358 / 629 = 2. 2 in Roman numerals can be written as II.
Find the sum of DCXXIX and CCLXXI.
The sum of DCXXIX and CCLXXI is DCM.
Sum is the result of adding two numbers.
DCXXIX = 629
CCLXXI = 271
629 + 271 = 900
900 in Roman Numerals is DCM. The sum of DCXXIX and CCLXXI is DCM.
What is the difference between DCC and DCXXIX?
The difference between DCC and DCXXIX is LXXI.
The difference of two numbers is the value we get when subtracting the number from the other.
DCC = 700
DCXXIX = 629
700 - 629 = 71
71 in Roman Numerals can be written as LXXI.
Write the Roman Numeral for 629 + 700 using the expansion method.
The Roman for 629 + 700 is MCCCXXIX
Step 1: First convert the numbers 629 and 700 into Roman numerals:
629 - DCXXIX
700 - DCC
Add the numbers together: 629 + 700 = 1329 Using expansion method: 1329 = 1000 + 300 + 20 + 9 = MCCCXXIX
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.