BrightChamps Logo
Login
Creative Math Ideas Image
Live Math Learners Count Icon145 Learners

Last updated on May 26th, 2025

Math Whiteboard Illustration

CMXVII in Roman Numerals

Professor Greenline Explaining Math Concepts

To meet their daily commerce and administration needs, the ancient Romans developed Roman Numerals. It 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 CMXVII.

CMXVII in Roman Numerals for Indian Students
Professor Greenline from BrightChamps

What is CMXVII in Roman Numerals?

Ancient Romans discovered that counting fingers could get very complicated after 10. So to overcome the 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 are used to represent numbers in the Roman numeric system — I, V, X, L, C, D, and M. The numerals are made up of different combinations of these symbols. CMXVII in Roman numerals can be written in number form by adding the values of each Roman numeral, i.e., CMXVII = 917.

 

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

cmxvii roman numerals

Professor Greenline from BrightChamps

Basic Rules for CMXVII in Roman Numerals

When writing Roman numerals, there are a few rules that we need to follow based on the Roman 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 value of the numeral. For example, XXX = 30.

 

Rule 3: Subtraction Method:

We use the subtraction method when a smaller symbol precedes a larger 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 CMXVII in Roman Numerals?

Let us learn about how to write CMXVII 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

CMXVII 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 is the breaking down of Roman numerals into numerical form and adding them to get the final number.

 

Step 1: Break the Roman numerals into parts.

Step 2: Now write each of the Roman numerals with its numerical digit in the place value.

Step 3: Add the numerals together.

 

For CMXVII,

Step 1: First, we break the Roman numerals. CMXVII = C + M + X + V + I + I

Step 2: Write the Roman Numerals for each part The Roman Numeral C is 100 The Roman Numeral M is 1000 The Roman Numeral X is 10 The Roman Numeral V is 5 The Roman Numeral I is 1

Step 3: Combine all the numbers C (1000 - 100) + X (10) + V (5) + I + I = 900 + 10 + 5 + 1 + 1 = 917. Therefore, the Roman Numeral CMXVII is 917.

Professor Greenline from BrightChamps

CMXVII 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, which makes 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 CMXVII.

Step 1: The larger Roman numerals are what we will begin with. Once split, the Roman numerals we get are CM, X, 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 X and VII to CM, and we will get CMXVII. The Roman numeral X is 10. The Roman numeral VII is 7. Therefore, the numeral of CMXVII is 917.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in CMXVII Roman Numerals

Students can make mistakes when studying Roman numerals. Here are a few common mistakes students make, and ways to avoid them.

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Mistakes when applying the repetition method

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

It can be quite confusing for beginners to remember that Roman Numerals cannot be repeated more than three times. Another thing to keep in mind is that Roman Numerals such as V, L, and D cannot be repeated.

 

For example, writing LL as 100 is incorrect; the correct answer is C.

Max from BrightChamps Saying "Hey"

CMXVII Roman Numerals Examples

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

Problem 1

What is the sum of CMXVII and LXXXIII? Write the answer in Roman numerals.

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

The sum is M

Explanation

Convert both Roman numerals into their decimal forms:

CMXVII = 917

LXXXIII = 83

Now add both numbers: 917 + 83 = 1000

Now convert the number into its Roman numeral: 1000 = M

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

Problem 2

Subtract CCCXV from CMXVII and express the result in Roman numerals.

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

The result is DCII

Explanation

Convert the Roman numerals into their decimal forms:

CMXVII = 917

CCCXV = 315

Now subtract the numbers: 917 - 315 = 602

Convert the number into its Roman numeral: 602 = 600 (DC) + 2 (II) = DCII

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

Problem 3

Multiply CMXVII by II and write the answer in Roman numerals.

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

MDCCCXXXIV

Explanation

Convert CMXVII into its decimal form:

CMXVII = 917

Multiply by 2: 917 × 2 = 1834

Convert 1834 into its Roman numerals: 1000 (M) + 800 (DCCC) + 30 (XXX) + 4 (IV) = MDCCCXXXIV

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

Problem 4

Divide CMXVII by VII and express the answer in Roman numerals.

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

CXXXI

Explanation

Convert CMXVII into its decimal form:

CMXVII = 917

Divide by 7: 917 / 7 = 131

Convert 131 into its Roman numerals: 100 (C) + 30 (XXX) + 1 (I) = CXXXI

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

Problem 5

Convert CMXVII into its decimal form.

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

In decimal form, CMXVII is 917

Explanation

Break CMXVII into components:

CM = 900 (1000 - 100)

XVII = 17 (10 + 5 + 1 + 1)

Add values: 900 + 17 = 917

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

FAQs on CMXVII in Roman Numerals

1.What is XVII in Roman numerals?

Math FAQ Answers Dropdown Arrow

2.Is CMXVII a prime number?

Math FAQ Answers Dropdown Arrow

3.What is CMXVII + CMXVII?

Math FAQ Answers Dropdown Arrow

4.What is MCMXVII?

Math FAQ Answers Dropdown Arrow

5.Subtract XVII from CMXVII

Math FAQ Answers Dropdown Arrow

6.How can children in India use numbers in everyday life to understand CMXVII in Roman Numerals?

Math FAQ Answers Dropdown Arrow

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

Math FAQ Answers Dropdown Arrow

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

Math FAQ Answers Dropdown Arrow

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

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for CMXVII in Roman Numerals

  • Limitation Rule: There are some symbols that cannot be repeated more than once (V, L, D). For example, writing VV for 10 is wrong; the correct answer is X.
     
  • Subtraction Rule: When a smaller numeral precedes a larger numeral, the smaller one is subtracted. For example, IV is 4 (5 - 1).
     
  • Addition Rule: When a smaller numeral follows a larger numeral, the numerals are added. For example, VI is 6 (5 + 1).
     
  • Place Value: The position of a digit in a number determines its value. For example, the number 9 in 917 is in the hundred's place.
     
  • Numerical Expansion: The process of breaking down Roman numerals into their constituent parts to find their equivalent numeric value.
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