72 in Roman Numerals
2026-02-28 11:05 Diff
https://brightchamps.com/en-us/math/numbers/72-in-roman-numerals

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Last updated on August 5, 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.

What is 72 in Roman Numerals?

The royal titles, such as Henry I, Henry II, and so on, often use Roman Numerals. Have you noticed the names and wondered what these symbols (I and II) represented? Those are the 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 LXXII to represent 72, where L is 50, X is 10, X is another 10, and II is 2. Let’s learn more about Roman numerals and how we write them.

Basic Rules for 72 in Roman Numerals

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, LXXII → L + X + X + I + I → 50 + 10 + 10 + 1 + 1 = 72.

Rule 2: Repetition Method

To write a larger number, certain Roman Numerals can be repeated up to three times. For example, XX → 20.

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. For example, XL → L - X → 50 - 10 = 40.

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 is written as VIII, not IIIIIIII.

How to Write 72 in Roman Numerals

Let’s now learn how to write 72 in Roman Numerals. Follow these methods to write the number in Roman Numerals.

  • By Expansion Method
  • By Grouping Method

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72 in Roman Numerals by Expansion Method

In the expansion method, based on the place value, the number is broken down. In this section, we will learn how to write 72 in Roman numerals using the expansion method.

To write 72 in Roman Numerals, follow these steps:

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

For 72, we write it as 50 + 10 + 10 + 2.

Step 2: Convert the numbers into Roman Numerals:

50 in Roman Numerals — L
10 in Roman Numerals — X
2 in Roman Numerals — II

Step 3: Combine them together:


Therefore, 72 in Roman Numerals is L (50) + X (10) + X (10) + II (2) = LXXII.

72 in Roman Numerals by Grouping Method

When writing a large number into Roman Numerals, we group the numbers. To write 72 in Roman Numerals, we group 72 as 50 + 10 + 10 + 2:

50 in Roman Numerals — L

10 in Roman Numerals — X

2 in Roman Numerals — II

So, 72 is written as LXXII in Roman Numerals.

Common Mistakes and How to Avoid Them in 72 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.

Problem 1

A historian is examining an ancient scroll that mentions a battle where LXII and X soldiers were involved. Calculate the total number of soldiers.

Okay, lets begin

The total number of soldiers is LXXII.

Explanation

The numbers in the scroll are given as LXII and X.  

LXII = 62  

X = 10  

Adding these gives 62 + 10 = 72.  

72 in Roman Numerals is written as LXXII.

Well explained 👍

Problem 2

A library contains a total of CCCLXXXVI scrolls, which need to be divided equally among VI shelves. How many scrolls will each shelf contain?

Okay, lets begin

Each shelf will contain LXIV scrolls.

Explanation

To find the number of scrolls per shelf, divide the total number of scrolls by the number of shelves.  

CCCLXXXVI = 386  

VI = 6  

386 / 6 = 64.  

64 in Roman Numerals is LXIV.

Well explained 👍

Problem 3

A mathematician is analyzing a sequence of numbers: XLV, XXVII, and wants the total sum. What is the result in Roman Numerals?

Okay, lets begin

The sum of XLV and XXVII is LXXII.

Explanation

To find the sum, add the given Roman numerals.  

XLV = 45  

XXVII = 27  

45 + 27 = 72.  

72 in Roman Numerals is LXXII.

Well explained 👍

Problem 4

In a puzzle game, a player needs to find the difference between LXXXIV and XII. What is the result?

Okay, lets begin

The difference between LXXXIV and XII is LXXII.

Explanation

The difference of two numbers is the result of subtracting one from the other.  

LXXXIV = 84  

XII = 12  

84 - 12 = 72.  

72 in Roman Numerals is LXXII.

Well explained 👍

Problem 5

Write the Roman Numeral for 35 + 37 using the expansion method.

Okay, lets begin

The Roman Numeral for 35 + 37 is LXXII.

Explanation

Step 1: Convert the numbers 35 and 37 into Roman numerals  

35 - XXXV  
37 - XXXVII  

Add the numbers together: 35 + 37 = 72  

Using the expansion method: 72 = 50 + 20 + 2 = LXXII

Well explained 👍

FAQs on 72 in Roman Numerals

1.What is 9 in Roman numerals?

IX is 9, as it uses the subtraction method with smaller numbers following larger ones. That is I - X, which is 10 - 1 = 9.

2.How to write 72 in Roman numerals?

Here, the larger numbers are followed by smaller ones, so we use the addition method: L(50) + X(10) + X(10) + II(2) = 72. So, LXXII is 72.

3.What is 16 in Roman Numerals?

16 in Roman Numerals is written as XVI.

4.Is LXXII a prime number?

No, 72 is not a prime number. It has several factors, including 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.

5.What are the multiples of 72?

The multiples of 72 are 72, 144, 216, 288, and so on.
 

Important Glossaries for 72 in Roman Numerals

  • Addition Rule: The addition method is used when a large number is followed by a smaller numeral; here, the values are added. For example, LXXII = L + X + X + II = 50 + 10 + 10 + 2 = 72.
  • Grouping Method: Here, the given numbers are grouped based on their place value and then converted into Roman numerals. For example, 72 = 50 + 10 + 10 + 2 = LXXII.
  • Repetition Rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, XX = 20 (X is repeated twice to represent the number 20).
  • Subtraction Rule: Used when a smaller numeral precedes a larger numeral, indicating subtraction. For example, XL = L - X = 50 - 10 = 40.
  • Limitation Rule: Some symbols like V, L, and D cannot be repeated. For example, 10 is written as X, not VV.

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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.

Fun Fact

: She loves to read number jokes and games.