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Last updated on May 26th, 2025

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70 in roman numerals

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Roman numerals are a way of expressing numbers using symbols. I, V, X, L, C, D, and M are the symbols we use. Roman Numerals are used in royal titles, book names, sequences, and so on. Here we will be discussing Roman Numerals, rules, and examples.

70 in roman numerals for US Students
Professor Greenline from BrightChamps

What is 70 in Roman Numerals?

The royal titles, such as Henry I, Henry II, and so on, have you noticed the names and wondered what these symbols (I and II) represented? Those are the Roman Numerals.

 

Earlier, people used to count using fingers, sticks, bones, etc. When life became complex, a standard form was required to count. Ancient Romans used the Roman Numeral system to count. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols we use to count.

 

In Roman Numerals, we use LXX to represent 70, here L is 50 and XX is 20. Let’s learn more about Roman numerals and how we write them.

 

70 in roman numerals

Professor Greenline from BrightChamps

Basic Rules for 70 in Roman Numerals

There are certain basic rules to write a number in Roman Numerals. In this section, let’s discuss some basic rules that need to be remembered when writing a number in Roman numerals.

 

Rule 1: Addition Method

 

The addition method is used when the smaller number is placed after the larger number. For example, LXX → L + X + X → 50 + 10 + 10 = 70

 

Rule 2: Repetition Method

 

To write a large number, certain Roman Numerals can be repeated up to three times. For example, XXX → 30.

 

Rule 3: Subtraction Method

 

If a smaller number precedes a larger number in Roman Numerals, we subtract the smaller number from the larger number. For example, XL → L - X → 50 - 10 = 40

 

Rule 4: Limitation Rule

 

The symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we won't write LL for 100; instead, we use C.

Professor Greenline from BrightChamps

How to Write 70 in Roman Numerals

Let’s now learn how to write 70 in Roman Numerals. Follow these methods to write the number in Roman Numerals. 

 

  • By Expansion Method
  • By Grouping Method
Professor Greenline from BrightChamps

70 in Roman Numeral by Expansion Method

In the expansion method, based on the place value, the number is broken down. In this section, we will learn how to write 70 in Roman numerals using the expansion method.

 

To write 70 in Roman Numerals, follow the steps:

 

Step 1: The number is broken down based on the place value. Place value that is tens, hundreds, etc.

For 70, we write it as 50 + 20


Step 2: Converting the number into Roman Numerals


    50 in Roman Numeral — L
    20 in Roman Numeral — XX

Step 3: Combining the Roman Numerals together.


Therefore, 70 in Roman Numeral is L (50) + XX (20) = LXX

Professor Greenline from BrightChamps

70 in Roman Numeral by Grouping Method

When writing a large number into Roman Numeral, we group the number. 


To write 70 in Roman Numeral, we group 70 as 50 + 20

50 in Roman Numeral — L

20 in Roman Numeral — XX

So, 70 is written as LXX in Roman Numerals

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Common Mistakes and How to Avoid Them in 70 Roman Numerals

Students make mistakes when writing a number in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and the ways to avoid them.

Mistake 1

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Errors in repetition method

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The repetition method can be confusing for beginners as it states that Roman Numerals cannot be repeated more than three times. In contrast, some Roman Numerals such as V, L, and D cannot be repeated. 

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70 in Roman Numerals Examples

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Problem 1

Calculate the sum of XLV and XXV.

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The sum of XLV and XXV is LXX.

Explanation

XLV is 45 and XXV is 25. Adding these gives us 45 + 25 = 70. 70 in Roman numerals is written as LXX.

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Problem 2

A historian distributes CCCLXX ancient coins to V groups equally. How many coins does each group receive?

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Each group receives LXX coins.

Explanation

Each group receives LXX coins.

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Max, the Girl Character from BrightChamps

Problem 3

Subtract XX from XC.

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The difference is LXX.

Explanation

XC is 90 and XX is 20. Subtracting these gives us 90 - 20 = 70. 70 in Roman numerals is written as LXX.

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Max, the Girl Character from BrightChamps

Problem 4

Convert the result of multiplying XIV by V into Roman numerals.

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The result is LXX.

Explanation

XIV is 14 and V is 5. Multiplying these gives us 14 × 5 = 70. 70 in Roman numerals is written as LXX.

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Max, the Girl Character from BrightChamps

Problem 5

Write the Roman Numeral for 35 + 35 using the expansion method.

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The Roman numeral for 35 + 35 is LXX.

Explanation

Step 1: Convert the numbers 35 and 35 into Roman numerals.  


35 - XXXV  
35 - XXXV

 

Add the numbers together: 35 + 35 = 70.  

Using the expansion method: 70 = 50 + 10 + 10 = LXX.

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FAQs on 70 in Roman Numerals

1.What is 69 in Roman numerals?

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2.How to write 70 in Roman numerals?

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3.What is 76 in Roman Numerals?

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4.Is LXX a prime number?

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5.What are the multiples of 70?

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6.How can children in United States use numbers in everyday life to understand 70 in roman numerals?

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7.What are some fun ways kids in United States can practice 70 in roman numerals with numbers?

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8.What role do numbers and 70 in roman numerals play in helping children in United States develop problem-solving skills?

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9.How can families in United States create number-rich environments to improve 70 in roman numerals skills?

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Professor Greenline from BrightChamps

Important Glossaries for 70 in Roman Numerals

  • Addition rule: The addition method is used when a large number is followed by a smaller numeral, here the values are added. For example, LXX = L + X + X = 50 + 10 + 10 = 70.

 

  • Grouping method: Here the given numbers are grouped based on their place value, and then we convert each group into its Roman numerals. For example, 70 = 50 + 20 = LXX.

 

  • Repetition rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, XXX = 30 (X is repeated three times to represent the number 30).

 

  • Subtraction rule: The subtraction method is used when a smaller numeral precedes a larger one. For example, XL = L - X = 50 - 10 = 40.

 

  • Limitation rule: Symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated.
Professor Greenline from BrightChamps

About BrightChamps in United States

At BrightChamps, we understand numbers are more than symbols—they unlock endless possibilities! Our goal is to guide children across the United States in mastering essential math skills, focusing today on the 70 in roman numerals with special attention to Roman numerals—in a fun, engaging, and easy-to-understand way. Whether your child is calculating how quickly a roller coaster zips through Disney World, tracking scores at Little League baseball games, or budgeting their allowance for cool gadgets, having solid number skills builds their confidence for daily tasks. Our interactive lessons make learning enjoyable and straightforward. Since kids across the USA have unique learning styles, we customize our methods to match each child. From the vibrant streets of New York City to the sunny beaches of California, BrightChamps makes math come alive, relatable, and exciting throughout America. Let’s bring Roman numerals to life on every child’s math path!
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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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: She loves to read number jokes and games.

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