BrightChamps Logo
Hamburger Menu Icon for BrightChamps Website Navigation
Login
Creative Math Ideas Image
Live Math Learners Count Icon138 Learners

Last updated on May 26th, 2025

Math Whiteboard Illustration

131 in Roman Numerals

Professor Greenline Explaining Math Concepts

Roman numerals are a way of expressing numbers using symbols. The symbols I, V, X, L, C, D, and M are used in this system. Roman numerals are found in royal titles, book names, sequences, and more. In this discussion, we will explore Roman numerals, their rules, and examples.

131 in Roman Numerals for Thai Students
Professor Greenline from BrightChamps

What is 131 in Roman Numerals?

 

Royal titles like Henry I, Henry II, and so forth, use Roman numerals. The symbols (I and II) represent numbers, and these are Roman numerals. In ancient times, people counted using fingers, sticks, bones, etc. As life became more complex, a standard form of counting was needed. The ancient Romans developed the Roman numeral system for this purpose. The symbols I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are used in this system.

 

In Roman numerals, we use CXXXI to represent 131, where C is 100, X is 10, and I is 1. Let’s learn more about Roman numerals and how to write them.

131 in roman numerals

 

Professor Greenline from BrightChamps

Basic Rules for 131 in Roman Numerals

There are certain basic rules to write numbers in Roman numerals. In this section, let’s discuss some basic rules that need to be remembered when writing numbers in Roman numerals.

 

Rule 1: Addition Method

The addition method is used when a smaller number is placed after a larger number. For example, CXXXI → C + X + X + I → 100 + 10 + 10 + 1 = 131.

 

Rule 2: Repetition Method

To write larger numbers, certain Roman numerals can be repeated up to three times. For example, XXX → 30.

 

Rule 3: Subtraction Method

If a smaller number is placed before a larger number, we subtract the smaller number from the larger number. For example, IX → X - I → 10 - 1 = 9.

 

Rule 4: Limitation Rule

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.

Professor Greenline from BrightChamps

How to Write 131 in Roman Numerals

Let’s now learn how to write 131 in Roman numerals. Follow these methods to write the number in Roman numerals. 

 

  • By Expansion Method
  •  
  • By Grouping Method
Professor Greenline from BrightChamps

131 in Roman Numeral by Expansion Method

To write 131 in Roman numerals, follow these steps:

 

Step 1: Break the number based on place value: ones, tens, hundreds, etc. 

 

For 131, we write it as 100 + 30 + 1.


Step 2: Convert each number into Roman numerals:


100 in Roman numerals — C
30 in Roman numerals — XXX
1 in Roman numerals — I


Step 3: Combine the Roman numerals together:

Therefore, 131 in Roman numerals is C (100) + XXX (30) + I (1) = CXXXI.

Professor Greenline from BrightChamps

131 in Roman Numeral by Grouping Method

When writing a large number into Roman numerals, we group the number. 


To write 131 in Roman numerals, we group 131 as 100 + 30 + 1.
100 in Roman numerals — C
30 in Roman numerals — XXX
1 in Roman numerals — I


So, 131 is written as CXXXI in Roman numerals.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in 131 Roman Numerals

Students often make mistakes when writing numbers in Roman numerals. To master Roman numerals, we can learn a few common mistakes and ways to avoid them.
 

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Errors in the repetition method
 

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

The repetition method can be confusing for beginners, as it states that Roman numerals cannot be repeated more than three times. In addition, some Roman numerals such as V, L, and D cannot be repeated.
 

Max from BrightChamps Saying "Hey"

131 in Roman Numerals Examples

Ray, the Character from BrightChamps Explaining Math Concepts
Max, the Girl Character from BrightChamps

Problem 1

A historian is cataloging CXXIV ancient coins, each with an inscription of VII. How many inscriptions are there in total?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The total number of inscriptions is DCCCXLVIII.
 

Explanation

To find the total number of inscriptions, multiply the number of coins by the number of inscriptions per coin.


CXXIV = 124


VII = 7


124 × 7 = 868


868 in Roman Numerals can be written as DCCCXLVIII.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 2

An art gallery has a collection of CCCCLXXVIII paintings, each grouped into sets of XXIX. Calculate how many sets there are.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The number of sets is XVI.
 

Explanation

To find the number of sets, divide the total number of paintings by the number of paintings per set.


CCCCLXXVIII = 478


XXIX = 29


478 ÷ 29 = 16


16 in Roman Numerals can be written as XVI.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 3

Calculate the sum of CLXI and LXX.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The sum of CLXI and LXX is CCXXXI.
 

Explanation

Sum is the result of adding two numbers.


CLXI = 161


LXX = 70


161 + 70 = 231


231 in Roman Numerals is CCXXXI.
 

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 4

What is the difference between CCXL and CIX?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The difference between CCXL and CIX is CXXXI.
 

Explanation

The difference of two numbers is the value we get when subtracting one number from the other.


CCXL = 240


CIX = 109


240 - 109 = 131


131 in Roman Numerals can be written as CXXXI.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 5

Write the Roman Numeral for 83 + 48 using the expansion method.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The Roman numeral for 83 + 48 is CXXXI.
 

Explanation

Step 1: First convert the numbers 83 and 48 into Roman numerals.


83 - LXXXIII


48 - XLVIII

Add the numbers together: 83 + 48 = 131


Using expansion method: 131 = 100 + 30 + 1 = CXXXI.

Max from BrightChamps Praising Clear Math Explanations
Ray Thinking Deeply About Math Problems

FAQs on 131 in Roman Numerals

1.What is IX in Roman numerals?

Math FAQ Answers Dropdown Arrow

2.How to write 131 in Roman numerals?

Math FAQ Answers Dropdown Arrow

3.What is 136 in Roman numerals?

Math FAQ Answers Dropdown Arrow

4.Is CXXXI a prime number?

Math FAQ Answers Dropdown Arrow

5.What are the multiples of 131?

Math FAQ Answers Dropdown Arrow

6.How can children in Thailand use numbers in everyday life to understand 131 in Roman Numerals?

Math FAQ Answers Dropdown Arrow

7.What are some fun ways kids in Thailand can practice 131 in Roman Numerals with numbers?

Math FAQ Answers Dropdown Arrow

8.What role do numbers and 131 in Roman Numerals play in helping children in Thailand develop problem-solving skills?

Math FAQ Answers Dropdown Arrow

9.How can families in Thailand create number-rich environments to improve 131 in Roman Numerals skills?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for 131 in Roman Numerals

  • Addition rule: The addition method is used when a larger number is followed by a smaller numeral, and here the values are added. For example, CXXXI = C + XXX + I = 100 + 30 + 1 = 131.

 

  • Grouping method: Here, the given number is grouped based on its place value, and then we convert each group into its Roman numerals. For example, 131 = 100 + 30 + 1 = CXXXI.

 

  • Repetition rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, XXX = 30 (X is repeated three times to represent the number 30).

 

  • Subtraction rule: This method is used when a smaller numeral is placed before a larger numeral, indicating subtraction. For example, IV = 5 - 1 = 4.

 

  • Limitation rule: Some symbols, such as V, L, and D, cannot be repeated, and no symbol can be repeated more than three times consecutively.
Professor Greenline from BrightChamps

About BrightChamps in Thailand

At BrightChamps, numbers are more than just figures—they open up endless possibilities! Our goal is to help children throughout Thailand develop essential math skills, focusing today on the 131 in Roman Numerals with a special emphasis on Roman numerals—in a lively, enjoyable, and easy-to-understand way. Whether your child is working out the speed of a roller coaster at Dream World, following scores at a local football match, or managing their allowance for new gadgets, mastering numbers gives them confidence for everyday tasks. Our engaging lessons make learning easy and fun. Because children in Thailand learn in different ways, we adapt our approach to fit each learner’s style. From bustling Bangkok streets to Phuket’s tropical islands, BrightChamps brings math alive, making it exciting and relevant across Thailand. Let’s make Roman numerals a fun part of every child’s math path!
Math Teacher Background Image
Math Teacher Image

Hiralee Lalitkumar Makwana

About the Author

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.

Math Teacher Fun Facts Image
Max, the Girl Character from BrightChamps

Fun Fact

: She loves to read number jokes and games.

INDONESIA - Axa Tower 45th floor, JL prof. Dr Satrio Kav. 18, Kel. Karet Kuningan, Kec. Setiabudi, Kota Adm. Jakarta Selatan, Prov. DKI Jakarta
INDIA - H.No. 8-2-699/1, SyNo. 346, Rd No. 12, Banjara Hills, Hyderabad, Telangana - 500034
SINGAPORE - 60 Paya Lebar Road #05-16, Paya Lebar Square, Singapore (409051)
USA - 251, Little Falls Drive, Wilmington, Delaware 19808
VIETNAM (Office 1) - Hung Vuong Building, 670 Ba Thang Hai, ward 14, district 10, Ho Chi Minh City
VIETNAM (Office 2) - 143 Nguyễn Thị Thập, Khu đô thị Him Lam, Quận 7, Thành phố Hồ Chí Minh 700000, Vietnam
Dubai - BrightChamps, 8W building 5th Floor, DAFZ, Dubai, United Arab Emirates
UK - Ground floor, Redwood House, Brotherswood Court, Almondsbury Business Park, Bristol, BS32 4QW, United Kingdom