Last updated on May 26th, 2025
Roman numerals are the 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. Have you noticed the names and wondered what these symbols (I and II) represented? Those are the Roman Numerals. Earlier people used to count using fingers, sticks, bones, etc. to count earlier. 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), D (100), and M (1000) are the symbols we use to count.
In Roman Numerals we use XI to represent 11, here 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.
Rule 1: Addition Method
The addition method is used when the number the smaller number is placed after the larger number, then it is the addition method. For example, XI → X + I → 10 + 1 = 11
Rule 2: Repetition Method
To write a large number, there are certain Roman Numerals that can be repeated three times. III → 3.
Rule 3: Subtraction Method
If a small number is followed by a large number in Roman Numerals we subtract the smaller number from the large number, it is a subtraction method. For example, IX → X - I → 10 - 1 = 9
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 and 8 we write as VIII not IIIIIIII.
Let’s now learn how to write 11 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 11 in Roman numerals using the expansion method.
To write 11 in Roman Numerals, follow the steps,
Step 1: The number is break based on the place value. Place value that is ones, tens, hundreds, etc.
For 11 we write it as 10 + 1
Step 2: Converting the number into Roman Numerals
10 in Roman Numeral — X
1 in Roman Numeral — I
Step 3: Combining them Roman Numerals together.
Therefore, 11 in Roman Numeral is X (10) + I (1) = XI
When writing a large number into Roman Numeral we group the number.
To write 11 in Roman Numeral, we group 11 as 10 + 1
10 in Roman Numeral — X
1 in Roman Numeral — I
So, 11 is written as XI in Roman Numerals.
Students make mistake when writing a number in Roman Numerals. To master Roman Numerals we can learn a few common mistakes and the ways to avoid them.
Find the product of XI and XII.
The product of XI and XII is CXXXII
In number XI is 11 and XII is 12. The product of XI and XII is 11 × 12 = 132. 132 in Roman Numerals can be written as CXXXII
A teacher wants to give CCCXXX books to XXX students. Find the number of books each student will get.
The number of books each student will get is XI
To find the number of books a student gets we divide the number of books by the total number of students.
That is CCCXXX / XXX
CCCXXX = 330
XXX = 30
Therefore, CCCXXX / XXX = 330 / 30 = 11.
11 in Roman numerals can be written as XI.
Find the sum of CCXX and XI
The sum of CCXX and XI is CCXXXI
Sum is the result of adding two numbers.
CCXX = 220
XI = 11
220 + 11 = 231
231 in Roman Numerals is CCXXXI
The sum of CCXX and XI is CCXXXI
What is the difference between XX and XI.
The difference between XX and XI is IX.
The difference of two numbers is the value we get when subtracting the number from the other
XX = 20
XI = 11
20 - 11 = 9
9 in Roman Numerals can be written as IX.
Write the Roman Numeral for 11 + 47 using the expansion method.
The Roman for 11 + 47 is LVIII
Step 1: First convert the numbers 11 and 47 into Roman numerals
11 - XI
47 - XLVII
Add the numbers together: 11 + 47 = 58
Using expansion method: 58 = 50 + 8 = LVIII
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.