IX Roman Numerals

IX Roman numerals are used to represent the number 9. One unique number system that is still in use today is Roman numerals. It involves assembling letters from the Latin alphabet to display numerals. 

You may still see Roman numerals around you. They are used on clocks, watches, for naming kings and queens (like Queen Elizabeth II, where II means 2), in movie titles, etc. You can also see Roman numerals on class names and chapter numbers in textbooks. Learning Roman numerals is fun because it feels like learning a secret code from history!

In this article, let’s learn how to write IX in Roman numerals, understand the rules, see related numbers, and solve some examples. 

 

Table of Contents

• How to Write IX in Roman Numerals?
• Rules to Write Roman Numerals
• Roman Numerals Related to IX
• IX Roman Numerals - Solved Examples
• Frequently Asked Questions on IX Roman Numerals

 

How to Write IX in Roman Numerals?

To write 9 in Roman numerals, we break it into its simplest form:

• Step 1: Break the number 9  into the least expanded form.

• Step 2:  9 can be written as 10 – 1.

• Step 3: In Roman numerals, 9 = 10 – 1 = X – 1, as  10 is X and 1 is I.

• When a smaller number comes before a larger number, we subtract.

• Therefore, IX in Roman numerals is 9.

 

Rules to Write Roman Numerals

The Roman numeral system is based on seven basic symbols: I for 1, V for 5, X for 10, L for 50, C for 100, D for 500, and M for 1000. A numeral can be repeated up to three times to increase its value, such as III for 3 or XXX for 30, but the symbols V, L, and D are never repeated. When a smaller numeral is written after a larger numeral, their values are added; for example, VI equals 6 and XV equals 15. 

 

On the other hand, when a smaller numeral is placed before a larger one, it is subtracted, such as IV for 4, IX for 9, XL for 40, and CM for 900. Only I, X, and C are used in this subtraction rule, and they cannot be subtracted from numerals more than ten times larger (for instance, I cannot be subtracted from L or C). Roman numerals are generally written in descending order from left to right, like MCCXX for 1220 or DCCLXV for 765. Finally, the Roman numeral system does not include a symbol for zero or for negative numbers.

 

Roman Numerals Related to IX

Here are some numbers related to 9 and how they are expressed in Roman numerals:

• Roman number related to 9 = IX

• Roman number for 19 = XIX (10 + 9)

• Roman number for 29 = XXIX (10 + 10 + 9)

• Roman number for 39 = XXXIX (10 + 10 + 10 + 9)

• Roman number for 49 = XLIX (40 + 9)

• Roman number for 59 = LIX (50 + 9)

• Roman number for 69 = LXIX (50 + 10 + 9)

• Roman number for 79 = LXXIX (50 + 10 + 10 + 9)

• Roman number for 89 = LXXXIX (50 + 10 + 10 + 10 + 9)

• Roman number for 99 = XCIX (90 + 9)
  
  

 

IX Roman Numerals -  Solved Examples

Example 1

Question: What is the value of 20 – 11? Express the value in Roman numerals.

Solution:
20 – 11 = 9
9 in Roman numerals = IX

 

Example 2

Question: Find the sum of IX and LIX.

Solution:

• IX = 9
  
  

• LIX = 59
  
  

So, 9 + 59 = 68
68 in Roman numerals = LXVIII

 

Frequently Asked Questions on IX Roman Numerals

Q1. What is IX  in Roman numerals?

Answer. IX in Roman numerals is 9.

Q2. Express the value of 4 + 5 in Roman numerals.

 Answer. 4 + 5 = 9. Hence, in Roman numerals, it is IX.

Q3. What should be added to 6 to get IX?

Answer. We add 3 to 6 to make 9. In Roman numerals, 3 = III.

Q4. Is IX the same as 9?

Answer. Yes, IX is the Roman numeral for 9, following the subtractive rule where a smaller numeral (I) placed before a larger numeral (X) is subtracted from the larger numeral (10 - 1 = 9)

Learning Roman numerals like IX for 9 helps us connect with history while improving number sense. Explore Orchids The International School’s learning resources and make maths easy and fun!