BrightChamps Logo
Hamburger Menu Icon for BrightChamps Website Navigation

Math Table of Contents Dropdown Table Of Contents

Creative Math Ideas Image
Live Math Learners Count Icon120 Learners

Last updated on February 28th, 2025

Math Whiteboard Illustration

CMLXXXVII in Roman Numerals

Professor Greenline Explaining Math Concepts
Foundation
Intermediate
Advance Topics

To meet their daily commerce and administration needs, the ancient Romans developed Roman numerals. They used a combination of seven symbols — I, V, X, L, C, D, and M to represent numbers. Roman numerals were used to record transactions, keep track of data, and label military units. In this topic, we are going to learn about the Roman numeral CMLXXXVII.

Professor Greenline from BrightChamps

What is CMLXXXVII in Roman Numerals?

Ancient Romans discovered that counting fingers could get very complicated after 10. To overcome this complexity, the Roman numeric system was developed.

 

This was widely used throughout Europe as a standard writing system until the late Middle Ages. Seven symbols represent numbers in the Roman numeric system — I, V, X, L, C, D, and M.

 

The numerals consist of different combinations of these symbols. CMLXXXVII in Roman numerals can be written in number form by adding the values of each Roman numeral, i.e., CMLXXXVII = 987.

 

Let us learn more about the Roman numeral CMLXXXVII, how we write it, the mistakes we usually make, and ways to avoid these mistakes.

cmlxxxvii roman numerals

Professor Greenline from BrightChamps

Basic Rules for CMLXXXVII in Roman Numerals

When writing Roman numerals, there are a few rules that we need to follow based on the numerals we are trying to write. In this section, we will learn about the rules when writing Roman numerals and how to represent them.

 

Rule 1: Addition Method:

When a larger symbol is followed by a smaller symbol, we add the numerals to each other. For example, in VIII, we have 5 + 3 = 8.

 

Rule 2: Repetition Method:

A symbol that is repeated three times in continuation increases the numeral's value. For example, XXX = 30.

 

Rule 3: Subtraction Method:

We use the subtraction method when a larger symbol follows a smaller symbol. For example, XL = 40 (which is 50 – 10).

 

Rule 4: Limitation Rule:

Symbols cannot be repeated more than three times, and some symbols, such as V, L, and D, cannot be repeated more than once. For example, 10 is represented as X and not VV.

Professor Greenline from BrightChamps

How to Write CMLXXXVII in Roman Numerals?

Let us learn how to write CMLXXXVII in Roman numerals. There are two methods that we can use to write Roman numerals:

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

CMLXXXVII in Roman Numeral by Expansion Method

The breaking down of Roman numerals into parts and then converting them into numerals is what we call the expansion method. The expansion method involves breaking down Roman numerals into numerical form and adding them to get the final number.

 

Step 1: Break the Roman numerals into parts.

 

Step 2: Write each Roman numeral with its numerical digit in the place value.

 

Step 3: Add the numerals together. For CMLXXXVII,

 

Step 1: First, we break the Roman numerals. CMLXXXVII = CM + L + X + X + X + V + I + I

 

Step 2: Write the Roman numerals for each part. The Roman Numeral CM is 900 The Roman Numeral L is 50 The Roman Numeral X is 10 The Roman Numeral V is 5 The Roman Numeral I is 1

 

Step 3: Combine all the numbers. CM + L + X + X + X + V + I + I = 900 + 50 + 10 + 10 + 10 + 5 + 1 + 1 = 987. Therefore, the Roman Numeral CMLXXXVII is 987.

Professor Greenline from BrightChamps

CMLXXXVII in Roman Numeral by Grouping Method

Using subtraction and addition rules, we will apply the grouping method. This means we break the Roman numerals into smaller groups, making it easier to work with. This method groups the Roman numerals logically, and then we write the numbers for each group.

 

Step 1: Take the largest number and write the number for that Roman numeral.

 

Step 2: Write the Roman numeral using the subtraction and addition rules. Example: Let’s take the Roman numeral CMLXXXVII.

 

Step 1: The larger Roman numerals are what we will begin with. Once split, the Roman numerals we get are CM, LXXX, and VII. The numeral for CM is 900.

 

Step 2: Now we need to either add or subtract the smaller number, depending on its place. Here we add LXXX and VII to CM, and we will get CMLXXXVII. The Roman numeral LXXX is 80. The Roman numeral VII is 7. Therefore, the numeral of CMLXXXVII is 987.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in CMLXXXVII Roman Numerals

Max from BrightChamps Saying "Hey"

CMLXXXVII Roman Numerals Examples

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

Problem 1

You have a collection of CMLXXXVII coins. You find another CLXVIII coins. How many coins do you have in total? Provide the answer in Roman numerals.

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

Explanation

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

Problem 2

If you have a ribbon that is CMLXXXVII cm long and you cut off DLIII cm, how much ribbon is left? Provide the answer in Roman numerals.

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

Explanation

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

Problem 3

What is one-third of CMLXXXVII? Give the answer in Roman numerals.

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

Explanation

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

Problem 4

Calculate the product of CMLXXXVII and III. Provide the answer in Roman numerals.

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

Explanation

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

Problem 5

Convert CMLXXXVII into its decimal form.

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

Explanation

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

FAQs on CMLXXXVII in Roman Numerals

1.What is LXXXVII in Roman numerals?

Math FAQ Answers Dropdown Arrow

2.Is CMLXXXVII a prime number?

Math FAQ Answers Dropdown Arrow

3.What is CMLXXXVII + CMLXXXVII?

Math FAQ Answers Dropdown Arrow

4.What is CMXC?

Math FAQ Answers Dropdown Arrow

5.Subtract LXXXVII from CMLXXXVII

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for CMLXXXVII in Roman Numerals

  • Limitation Rule: There are some symbols that cannot be repeated more than once (V, L, D). For example, LVV for 60 is wrong; the correct answer is LX.

 

  • Place value: The position of a digit in a number; this position determines its value. For example, the number 9 in 987 is in the hundred's place.

 

  • Subtraction Method: Used when a smaller symbol precedes a larger one to indicate subtraction. For example, IV (4) is 5 - 1.

 

  • Addition Method: Used when a smaller symbol follows a larger one to indicate addition. For example, VI (6) is 5 + 1.

 

  • Roman Numeral System: An ancient numeral system using combinations of letters from the Latin alphabet (I, V, X, L, C, D, M) to signify values.
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.

BrightChamps Logo
Follow Us
BrightChamps Facebook Page IconBrightChamps YouTube Channel IconBrightChamps Instagram IconBrightChamps LinkedIn Page Icon
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