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 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 CC to represent 200, where C is 100. 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.
Rule 1: Addition Method
The addition method is used when the smaller number is placed after the larger number. For example, CC → C + C → 100 + 100 = 200.
Rule 2: Repetition Method
To write a large number, certain Roman numerals can be repeated up to three times. For example, CCC → 300.
Rule 3: Subtraction Method
If a smaller number is followed by a larger number in Roman numerals, we subtract the smaller number from the larger number. For example, XC → C - X → 100 - 10 = 90.
Rule 4: Limitation Rule
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. Similarly, 8 is written as VIII, not IIIIIIII.
Let’s now learn how to write 200 in Roman numerals. Follow these methods to write the number in Roman numerals:
In the expansion method, based on place value, the number is broken down. In this section, we will learn how to write 200 in Roman numerals using the expansion method.
To write 200 in Roman numerals, follow these steps:
Step 1: Break the number based on place value: hundreds, tens, ones, etc.
For 200, we write it as 100 + 100.
Step 2: Convert the number into Roman numerals:
- 100 in Roman numeral — C
Step 3: Combine the Roman numerals together.
- Therefore, 200 in Roman numeral is C (100) + C (100) = CC.
When writing a large number into Roman numerals, we group the number. To write 200 in Roman numerals, we group 200 as 100 + 100:
- 100 in Roman numeral — C
- So, 200 is written as CC in Roman numerals.
Students often 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.
A historian is cataloging artifacts and finds CC ancient coins in one box and LXXV in another. How many coins does she have in total?
The historian has CCLXXV coins in total.
To find the total number of coins, add the coins from both boxes:
CC = 200
LXXV = 75
200 + 75 = 275
275 in Roman numerals is CCLXXV.
A library received C books from one donor and another C books from a second donor. How many books did the library receive in total?
The library received CC books in total.
To find the total number of books, add the books from both donors:
C = 100
100 + 100 = 200
200 in Roman numerals is CC.
A marathon event requires participants to run a total of CC kilometers. If each participant runs XX kilometers a day, how many days will it take to complete the marathon?
It will take X days for a participant to complete the marathon.
To find the number of days, divide the total kilometers by the kilometers run per day:
CC = 200
XX = 20
200 / 20 = 10
10 in Roman numerals is X.
Calculate the difference between CCC and CC.
The difference between CCC and CC is C.
The difference of two numbers is the value we get when subtracting one number from the other:
CCC = 300
CC = 200
300 - 200 = 100
100 in Roman numerals is C.
Write the Roman numeral for 200 minus 150 using the subtraction method.
The Roman numeral for 200 minus 150 is L.
Step 1: Convert the numbers into Roman numerals:
200 - CC
150 - CL
Subtract the numbers: 200 - 150 = 50
50 in Roman numerals is L.
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.