BrightChamps Logo
Hamburger Menu Icon for BrightChamps Website Navigation
Login
Creative Math Ideas Image
Live Math Learners Count Icon130 Learners

Last updated on May 26th, 2025

Math Whiteboard Illustration

920 in Roman Numerals

Professor Greenline Explaining Math Concepts

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.

920 in Roman Numerals for Vietnamese Students
Professor Greenline from BrightChamps

What is 920 in Roman Numerals?

The royal titles, such as Henry I, Henry II, and so on, use Roman Numerals. Have you noticed these 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. 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 CMXX to represent 920, where CM is 900 and XX is 20. Let’s learn more about Roman numerals and how we write them.

920 in roman numerals

Professor Greenline from BrightChamps

Basic Rules for 920 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, XX → X + X → 10 + 10 = 20.

 

Rule 2: Repetition Method

To write a large number, certain Roman Numerals can be repeated up to 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. For example, CM → M - C → 1000 - 100 = 900.

 

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.

Professor Greenline from BrightChamps

How to Write 920 in Roman Numerals

Let’s now learn how to write 920 in Roman Numerals. Follow these methods to write the number in Roman Numerals.

 

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

920 in Roman Numeral 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 920 in Roman numerals using the expansion method. To write 920 in Roman Numerals, follow the steps:

 

Step 1: Break the number based on the place value. Place values are ones, tens, hundreds, etc. For 920, we write it as 900 + 20.

 

Step 2: Converting the number into Roman Numerals:

  • 900 in Roman Numeral - CM
  • 20 in Roman Numeral - XX

 

Step 3: Combining the Roman Numerals together: Therefore, 920 in Roman Numeral is CM (900) + XX (20) = CMXX.

Professor Greenline from BrightChamps

920 in Roman Numeral by Grouping Method

When writing a large number into Roman Numerals, we group the number. To write 920 in Roman Numerals, we group 920 as 900 + 20.

 

  • 900 in Roman Numeral - CM
     
  • 20 in Roman Numeral - XX

 

So, 920 is written as CMXX in Roman Numerals.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in 920 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.

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Errors in 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 contrast, some of the Roman Numerals such as V, L, and D cannot be repeated.

Max from BrightChamps Saying "Hey"

920 in Roman Numerals Examples

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

Problem 1

A historian discovers a scroll that mentions a battle involving CMXX soldiers. If each soldier was armed with III weapons, find the total number of weapons used in the battle.

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

The total number of weapons used in the battle is MMMDCLX.

Explanation

Each of the CMXX soldiers had III weapons.

Thus, the total number of weapons is calculated as CMXX × III.

CMXX = 920

III = 3

920 × 3 = 2760

2760 in Roman numerals is MMMDCLX.

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

Problem 2

An ancient architect designed a building with CMXX columns, and each column supports X floors. Calculate the total number of floors supported by these columns.

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

The total number of floors supported by the columns is IXCC.

Explanation

To find the total number of floors, multiply the number of columns by the number of floors each supports.

CMXX = 920

X = 10

920 × 10 = 9200

9200 in Roman numerals is IXCC.

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

Problem 3

A museum has CMXX artifacts equally distributed across XX exhibits. Determine the number of artifacts per exhibit.

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

Each exhibit has XLVI artifacts.

Explanation

To find the number of artifacts per exhibit, divide the total number of artifacts by the number of exhibits.

CMXX = 920

XX = 20

920 / 20 = 46

46 in Roman numerals is XLVI.

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

Problem 4

A library has CMXX books. If they acquire an additional CC books, how many books will they have in total?

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

The library will have MCLXX books in total.

Explanation

To find the total number of books, add the number of additional books to the original number of books.

CMXX = 920

CC = 200

920 + 200 = 1120

1120 in Roman numerals is MCLXX.

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

Problem 5

Write the Roman Numeral for 920 - 45 using the subtraction method.

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

The Roman numeral for 920 - 45 is DCCCLXXV.

Explanation

Step 1: Convert the numbers 920 and 45 to Roman numerals.

920 - CMXX

45 - XLV

Step 2: Subtract the numbers: 920 - 45 = 875

875 in Roman numerals is DCCCLXXV.

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

FAQs on 920 in Roman Numerals

1.What is 900 in Roman numerals?

Math FAQ Answers Dropdown Arrow

2.How to write 920 in Roman numerals?

Math FAQ Answers Dropdown Arrow

3.What is 1000 in Roman Numerals?

Math FAQ Answers Dropdown Arrow

4.Is CMXX a prime number?

Math FAQ Answers Dropdown Arrow

5.What are the multiples of 920?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for 920 in Roman Numerals

  • Addition rule: The addition method is used when a large number is followed by a smaller numeral, where the values are added. For example, XX = X + X = 10 + 10 = 20.

 

  • Grouping method: Here, the given numbers are grouped based on their place value and then converted into their Roman numerals. For example, 920 = 900 + 20 = CMXX.

 

  • Repetition rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, III = 3 (I is repeated three times to represent the number 3).

 

  • Subtraction rule: This method is used when a smaller numeral precedes a larger one, subtracting its value. For example, CM = 1000 - 100 = 900.

 

  • Symbols: Roman numerals use specific symbols like I, V, X, L, C, D, and M to represent numbers.
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