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.
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 Roman numerals.
Earlier people used fingers, sticks, bones, etc., to count. 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 CMXIII to represent 913, where C is 100, M is 1000, X is 10, and I is 1. 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 a smaller number is placed after a larger number. For example, XIII → X + I + I + I → 10 + 1 + 1 + 1 = 13
To write certain numbers, Roman numerals can be repeated up to three times. For example, III → 3.
If a small number is followed by a larger number in Roman numerals, we subtract the smaller number from the larger number. For example, IX → X - I → 10 - 1 = 9
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 913 in Roman numerals. Follow these methods to write the number in Roman numerals.
In the expansion method, the number is broken down based on the place value. In this section, we will learn how to write 913 in Roman numerals using the expansion method. To write 913 in Roman numerals, follow these steps:
Step 1: Break the number based on the place value: hundreds, tens, and ones. For 913, we write it as 900 + 10 + 3.
Step 2: Convert each number into Roman numerals.
Step 3: Combine the Roman numerals together. Therefore, 913 in Roman numerals is CM (900) + X (10) + III (3) = CMXIII.
When writing a large number into Roman numerals, we group the number. To write 913 in Roman numerals, we group 913 as 900 + 10 + 3.
So, 913 is written as CMXIII 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 the ways to avoid them.
A historian finds two ancient artifacts marked with the numbers CMXIII and LIII. He wants to calculate the total value of these artifacts. What is the sum in Roman numerals?
The sum of CMXIII and LIII is CMLXVI
To find the sum, we convert the Roman numerals to their decimal form and add them.
CMXIII = 913
LIII = 53
913 + 53 = 966
966 in Roman numerals can be written as CMLXVI
A museum received a donation of CMXIII coins and wants to display them equally in XIII cases. How many coins will each case contain?
Each case will contain LXXI coins.
To find out how many coins each case will contain, divide the total number of coins by the number of cases.
CMXIII = 913
XIII = 13
913 ÷ 13 = 71
71 in Roman numerals can be written as LXXI
Calculate the difference between M and CMXIII and express it in Roman numerals.
The difference between M and CMXIII is LXXXVII.
The difference is found by subtracting the smaller number from the larger number.
M = 1000
CMXIII = 913
1000 - 913 = 87
87 in Roman numerals can be written as LXXXVII
If a collection of CXXI paintings is increased by CMXIII new paintings, what is the new total in Roman numerals?
The new total is MXXXIV.
To find the new total, add the number of new paintings to the existing collection.
CXXI = 121
CMXIII = 913
121 + 913 = 1034
1034 in Roman numerals can be written as MXXXIV
A scholar deciphers an ancient text that refers to a year as the difference between MM and CMXIII. What is this year in Roman numerals?
The year is MLXXXVII.
To find the year, subtract the given number from the larger number.
MM = 2000
CMXIII = 913
2000 - 913 = 1087
1087 in Roman numerals can be written as MLXXXVII
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.