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Last updated on February 27th, 2025

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X Roman Numerals

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Foundation
Intermediate
Advance Topics

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 X.

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What is X 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. X in Roman numerals can be written in number form as 10.

 

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

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Basic Rules for X 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 VI, we have 5 + 1 = 6.

 

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, IX = 9 (which is 10 – 1).

 

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.

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How to Write X in Roman Numerals?

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

 

  • By Expansion Method
  • By Grouping Method
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X 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 X,

Step 1: First, we break the Roman numeral. X = X

 

Step 2: Write the Roman Numeral for the part. The Roman Numeral X is 10.

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X 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 X.

 

Step 1: The larger Roman numeral is what we will begin with. The numeral for X is 10. Therefore, the numeral of X is 10.

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Common Mistakes and How to Avoid Them in X Roman Numerals

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X Roman Numerals Examples

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Problem 1

A Roman merchant has X apples and receives an additional XII apples. How many apples does he have now? Write the answer in Roman numerals.

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Explanation

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Problem 2

A Roman architect is designing a structure that is X feet tall. He decides to increase its height by V feet. What is the new height in Roman numerals?

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Explanation

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Problem 3

A Roman historian recorded that a battle lasted X hours and concluded at the VI hour of the day. What hour did the battle start? Provide the answer in Roman numerals.

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Explanation

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Problem 4

A Roman blacksmith forged X swords, and each sword required III hours of labor. How many total hours of labor did the blacksmith spend? Express your answer in Roman numerals.

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Explanation

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Problem 5

Convert X into its decimal form.

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Explanation

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FAQs on X in Roman Numerals

1.What is IX in Roman numerals?

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2.Is X a prime number?

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3.What is X + X?

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4.What is XX?

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5.Subtract V from X

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Important Glossaries for X in Roman Numerals

  • Limitation Rule: There are some symbols that cannot be repeated more than once (V, L, D). For example, VV for 10 is wrong, the correct answer is X.
     
  • Place value: The position of a digit in a number, this position determines its value. For example, the number 1 in 10 is in the ten's place.
     
  • Subtraction Method: A method used when a smaller numeral precedes a larger numeral. For example, IX = 9.
     
  • Addition Method: A method used when a larger numeral is followed by a smaller numeral. For example, VI = 6.
     
  • Repetition Method: A method where symbols can be repeated up to three times to increase the numeral's value. For example, XXX = 30.
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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.

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Fun Fact

: She loves to read number jokes and games.

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