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., to count. 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 LXXX to represent 80, where L is 50 and XXX is 30. 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.
The addition method is used when the smaller number is placed after the larger number. For example, LXXX → L + X + X + X → 50 + 10 + 10 + 10 = 80
To write a large number, there are certain Roman Numerals that can be repeated three times. XXX → 30 (X is repeated three times).
If a small number is placed before a larger number in Roman Numerals, we subtract the smaller number from the larger number. For example, XL → L - X → 50 - 10 = 40
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 80 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 80 in Roman numerals using the expansion method.
To write 80 in Roman Numerals, follow the steps:
Step 1: Break the number based on place value. Place value includes ones, tens, hundreds, etc.
For 80, we write it as 50 + 10 + 10 + 10.
Step 2: Converting the number into Roman Numerals:
- 50 in Roman Numeral — L
- 10 in Roman Numeral — X
Step 3: Combine the Roman Numerals together.
Therefore, 80 in Roman Numeral is L (50) + X (10) + X (10) + X (10) = LXXX.
When writing a large number into Roman Numerals, we group the number.
To write 80 in Roman Numeral, we group 80 as 50 + 30.
50 in Roman Numeral — L
30 in Roman Numeral — XXX
So, 80 is written as LXXX 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.
A historian found an ancient scroll that mentioned two consecutive Roman emperors, one reigning for XL years and the next for XL years. What is the total number of years both emperors reigned?
The total number of years both emperors reigned is LXXX.
Each emperor reigned for XL (40) years. Adding both reigns together, we have 40 + 40 = 80. In Roman Numerals, 80 is represented as LXXX.
An architect designed a building with a total of CCCXX floors divided equally among IV sections. How many floors does each section have?
Each section has LXXX floors.
To find the number of floors per section, divide the total number of floors by the number of sections:
CCCXX = 320
IV = 4
320 divided by 4 equals 80. In Roman Numerals, 80 is LXXX.
Calculate the sum of LX and XX.
The sum of LX and XX is LXXX.
Adding the two Roman numerals:
LX = 60
XX = 20
The sum is 60 + 20 = 80. In Roman Numerals, 80 is LXXX.
A museum exhibit features a Roman artifact that is said to be XX years older than another artifact dated at LX years. How old is the older artifact?
The older artifact is LXXX years old.
The older artifact is XX (20) years older than the LX (60) year old artifact:
60 + 20 = 80. 80 in Roman Numerals is LXXX.
Express the difference between C and XX in Roman numerals using subtraction.
The difference between C and XX is LXXX.
Subtract the two numbers:
C = 100
XX = 20
The difference is 100 - 20 = 80. In Roman Numerals, 80 is LXXX.
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.