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 Icon227 Learners

Last updated on February 19th, 2025

Math Whiteboard Illustration

IX in Roman Numerals

Professor Greenline Explaining Math Concepts
Foundation
Intermediate
Advance Topics

IX in Roman Numerals is the representation of the number 9. It can be written as numbers by combining the converted Roman numerals, like IX = (X-I) = (10-1) = 9. Did you know? Roman numerals are used in daily life for numbering monuments, monarchs or time period.

Professor Greenline from BrightChamps

What is IX in Roman Numerals?

According to the symbols used for Roman Numerals, I denote 1 and X denotes 10. Symbols are placed in a variety of ways, to represent the numbers. We join these symbols through rules assigned for Roman numerals, to get IX, i.e., 9. In the next section, we will see how the rules work to represent numbers.
 

Professor Greenline from BrightChamps

Basic Rules for 9 in Roman Numerals

Rule 1: Addition method


When a letter with greater numerical value precedes a letter with smaller numerical value, the letters are added.

Ex: XI, where, X=10 and I=1, X > I. So,


XI=X+I=10+1=11.


Rule 2: Repetition Method: If a letter repeats itself for two or three times, the letters are added together. Ex: XXX, where X=10, so, XXX=X+X+X=10+10+10=30


Rule 3: Subtraction method


When a letter with smaller numerical value precedes a letter with greater numerical value, the letters are subtracted.

Ex: XL, where, X=10 and L=50, X < L. So,


XL=L-X=50-10=40. 


Here, for IX, the Subtraction method applies. IX=X-I=10-1=9. 


Rule 4: Limitation Rule 


The same letter or symbol cannot be repeated more than thrice. Ex: 40=XL, and 40≠ XXXX.
 

Professor Greenline from BrightChamps

IX in Roman Numeral by Expansion Method

This method involves breaking down numbers into parts based on place values like thousands, hundreds, tens, or ones. Each place value is then expressed as Roman numeral equivalent. 


This method works by:


i) Expand and break the number into its place values.


ii) Convert each place value into an equivalent Roman numeral.


iii) Combine the acquired Roman numerals to get the result

 

Ex: 952


900 → 1000-100 = M-C =CM


50 → L


2 → II


Combining, CMLII


    Ex : 94


90 →100-10=C- X= XC


4 → IV


Combining, XCIV
 

Professor Greenline from BrightChamps

IX in Roman Numeral by Grouping Method

This method involves breaking down of larger Roman numerals into smaller, based on the values of individual Roman numeral symbol. This method works by:


 i) Identifying groups: Look for numerals that should be added together or subtracted, based on the Addition and Subtraction rules explained in the previous section.


ii) Break into smaller and simpler parts.


iii) Add or subtract values.

 

Ex: LXXXIX


L → 50


XXX : 30→ X+X+X=10+10+10=30


IX → 9


Add 50+30+9 =89


Ex: XCVII


XC : 90 →100-10=90


V  →5


II: 2→I+I=1+1=2


Add 90+5+2=97
 

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in IX

Max from BrightChamps Saying "Hey"

IX in Roman Numerals Examples

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

Problem 1

Add VIII and IX

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

Subtract XLIX - IX .

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

Multiply IX with IX.

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

Divide LXXXI by IX.

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

Find all the perfect squares between 1 to 100 and convert them in Roman numerals.

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 IX in Roman Numerals

1.What comes after XIX?

Math FAQ Answers Dropdown Arrow

2.What number is XX?

Math FAQ Answers Dropdown Arrow

3.What number is L?

Math FAQ Answers Dropdown Arrow

4.What is XCIX?

Math FAQ Answers Dropdown Arrow

5.What is Z in roman numeral?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for 9 in Roman Numerals

  • Roman numerals: Numeral system used in Rome, where the numbers represent Latin Alphabets like I, X, C, M etc.


Basic Roman Numerals -

 

I :  1
II :  2
III :  3
IV :  4
V :  5
VI :  6
VII :  7
VIII :  8
IX :  9
X :  10
L : 50
C : 100
D : 500
M : 1000

 

  • XCIX: Represents 99 in roman numeral

 

  • Expansion Method: This method involves breaking down numbers into parts based on place

values like thousands, hundreds, tens, or ones.

 

  • Grouping Method: This method involves breaking down of larger Roman numerals into smaller

 
 

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