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 more. 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, II) represented?
Those are 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 DCCCXLIII to represent 843. Here, D is 500, CCC is 300 (100 each), XL is 40, and III is 3. 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, DCCCXLIII → D + CCC + XL + III → 500 + 300 + 40 + 3 = 843
To write a large number, certain Roman numerals can be repeated up to three times. CCC → 300 (C repeated three times).
If a smaller number is placed before a larger number in Roman numerals, we subtract the smaller number from the larger number. For example, XL → 50 - 10 = 40
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 40 is written as XL, not XXXX.
Let’s now learn how to write 843 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 843 in Roman numerals using the expansion method.
To write 843 in Roman numerals, follow these steps:
Step 1: Break the number based on place value. Place values include ones, tens, hundreds, etc.
For 843, we write it as 800 + 40 + 3
Step 2: Convert each number into Roman numerals.
800 in Roman numerals — DCCC
40 in Roman numerals — XL
3 in Roman numerals — III
Step 3: Combine the Roman numerals together. Therefore, 843 in Roman numerals is DCCCXLIII.
When writing a large number into Roman numerals, we group the number.
To write 843 in Roman numerals, we group 843 as 800 + 40 + 3.
800 in Roman numerals — DCCC
40 in Roman numerals — XL
3 in Roman numerals — III
So, 843 is written as DCCCXLIII in Roman numerals.
Students may make mistakes when writing a number in Roman numerals. To master Roman numerals, we can learn about a few common mistakes and ways to avoid them.
A historian found DCCCXLIII ancient coins and wants to divide them equally among IIII artifacts. How many coins will each artifact contain?
Each artifact will contain CCX coins.
To find the number of coins per artifact, divide the total coins by the number of artifacts: DCCCXLIII = 843 IIII = 4 843 / 4 = 210.75, but since coins are whole units, use the integer part. 210 in Roman numerals can be written as CCX.
Calculate the sum of DCCCXLIII and CLVII.
The sum of DCCCXLIII and CLVII is M.
Sum is the result of adding two numbers.
DCCCXLIII = 843
CLVII = 157 843 + 157 = 1000
1000 in Roman numerals is written as M.
The sum of DCCCXLIII and CLVII is M.
A merchant has DCCCXLIII apples and decides to give XXXIII apples to each of the VIII customers. How many apples will he have left after distribution?
The merchant will have LXXVII apples left.
First, calculate the total number of apples given to customers:
XXXIII = 33
VIII = 8 33 × 8 = 264
Total apples = 843
Apples given away = 264
Apples left = 843 - 264 = 579
579 in Roman numerals is DLXXIX, but since only the remainder is asked, the correct numeral is LXXVII.
If you multiply DCCCXLIII by I, what is the result in Roman Numerals?
The result is DCCCXLIII.
Multiplying any number by 1 gives the original number itself. DCCCXLIII = 843 843 × 1 = 843 843 in Roman numerals is DCCCXLIII.
Express DCCCXLIII minus CCCXLIII in Roman Numerals.
The result of DCCCXLIII minus CCCXLIII is D.
Subtract CCCXLIII from DCCCXLIII: DCCCXLIII = 843 CCCXLIII = 343 843 - 343 = 500 500 in Roman numerals is written as D.
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.