Last updated on May 26th, 2025
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.
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.
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.
Let’s now learn how to write 70 in Roman Numerals. Follow these methods to write the number in Roman Numerals.
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
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
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.
Calculate the sum of XLV and XXV.
The sum of XLV and XXV is LXX.
XLV is 45 and XXV is 25. Adding these gives us 45 + 25 = 70. 70 in Roman numerals is written as LXX.
A historian distributes CCCLXX ancient coins to V groups equally. How many coins does each group receive?
Each group receives LXX coins.
Each group receives LXX coins.
Subtract XX from XC.
The difference is LXX.
XC is 90 and XX is 20. Subtracting these gives us 90 - 20 = 70. 70 in Roman numerals is written as LXX.
Convert the result of multiplying XIV by V into Roman numerals.
The result is LXX.
XIV is 14 and V is 5. Multiplying these gives us 14 × 5 = 70. 70 in Roman numerals is written as LXX.
Write the Roman Numeral for 35 + 35 using the expansion method.
The Roman numeral for 35 + 35 is LXX.
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.
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.
: She loves to read number jokes and games.