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Last updated on May 26th, 2025

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MMXX in Roman Numerals

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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 MMXX.

MMXX in Roman Numerals for Indonesian Students
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What is MMXX 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. MMXX in Roman numerals can be written in number form by adding the values of each Roman numeral, i.e. MMXX = 2020.

 

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

mmxx roman numerals

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Basic Rules for MMXX 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 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.

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How to Write MMXX in Roman Numerals?

Let us learn about how to write MMXX 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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MMXX 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 MMXX,

Step 1: First we break the Roman numerals. MMXX = M + M + X + X

Step 2: Write the Roman Numerals for each part The Roman Numeral M is 1000 The Roman Numeral X is 10

Step 3: Combine all the numbers M + M + X + X = 1000 + 1000 + 10 + 10 = 2020. Therefore, the Roman Numeral MMXX is 2020.

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MMXX 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 MMXX.

Step 1: The larger Roman numerals are what we will begin with. Once split, the Roman numerals we get are MM and XX. The numeral for MM is 2000

Step 2: Now we need to either add or subtract the smaller number, depending on its place.

 

Here we add XX to MM and we will get MMXX. The Roman numeral XX is 20 Therefore, the numeral of MMXX is 2020.

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Common Mistakes and How to Avoid Them in MMXX 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

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Mistakes when applying the repetition method

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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.

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mmxx Roman Numerals Examples

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Problem 1

If the year MMXVIII was followed by a leap year, what is the Roman numeral for that leap year?

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The leap year following MMXVIII is MMXX.

Explanation

Convert the Roman numeral MMXVIII to its decimal form:

MMXVIII = 2018

A leap year occurs every 4 years, so add 2 years to find the next leap year: 2018 + 2 = 2020

Convert 2020 to Roman numerals: 2020 = 2000 (MM) + 20 (XX) = MMXX

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Problem 2

A historical event took place in the year MCMXCIX. How many years have passed since then until the year MMXX?

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21 years have passed since MCMXCIX until MMXX.

Explanation

Convert the Roman numerals to decimal form:

MCMXCIX = 1999

MMXX = 2020

Calculate the difference between the two years: 2020 - 1999 = 21

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Problem 3

A treasure map indicates that a hidden chest was buried in the year MDL. How many centuries later is the year MMXX?

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The year MMXX is 5 centuries later than MDL.

Explanation

Convert the Roman numerals to decimal form:

MDL = 1550

MMXX = 2020

Calculate the difference in years: 2020 - 1550 = 470

Convert years into centuries: 470 years = 4.7 centuries

Round to the nearest whole number: 5 centuries

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Problem 4

What is the sum of the Roman numeral years MMXV and MMV? Write the answer in Roman numerals.

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The sum is MMXX.

Explanation

Convert the Roman numerals into decimal form:

MMXV = 2015

MMV = 2005

Now add both numbers: 2015 + 2005 = 4020

Convert the sum into Roman numerals: 4020 = 4000 (MMMM) + 20 (XX) = MMXX

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Problem 5

In the Roman numeral system, what is the halfway point between the years MCMXL and MMX?

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The halfway point is MCMLXV.

Explanation

Convert the Roman numerals to decimal form:

MCMXL = 1940

MMX = 2010

Calculate the midpoint: (1940 + 2010) / 2 = 1975

Convert 1975 into Roman numerals: 1975 = 1000 (M) + 900 (CM) + 70 (LXX) + 5 (V) = MCMLXV

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FAQs on MMXX in Roman Numerals

1.What is XX in Roman numerals?

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2.Is MMXX a leap year?

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3.What is MMXX + MMXX?

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4.What is MCMXX?

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5.Subtract C from MMXX

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6.How can children in Indonesia use numbers in everyday life to understand MMXX in Roman Numerals?

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

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

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

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Important Glossaries for MMXX in Roman Numerals

Addition Method: A method used in Roman numerals where symbols are added to each other when a larger symbol is followed by a smaller one.

Repetition Method: A method where symbols are repeated to increase their value, but not more than three times.

Subtraction Method: A method used when a smaller symbol precedes a larger one to indicate subtraction.

Grouping Method: Technique of grouping Roman numerals into smaller parts to simplify understanding and calculation.

Place Value: The numerical value that a digit has by virtue of its position in a number.

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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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