Last updated on May 26th, 2025
Roman numerals are the 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 LXXIX to represent 79, here L is 50, XX is 20, and IX is 9. 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 a smaller number is placed after a larger number, then it is the addition method. For example, LXX → L + X + X → 50 + 10 + 10 = 70
To write certain numbers, some Roman Numerals can be repeated up to three times. For example, XXX → 30.
If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the larger number. This is called the subtraction method. For example, IX → X - I → 10 - 1 = 9
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, and 8 is written as VIII, not IIIIIIII.
Let’s now learn how to write 79 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 79 in Roman numerals using the expansion method.
To write 79 in Roman Numerals, follow these steps:
Step 1: The number is broken down based on the place value. Place values include ones, tens, hundreds, etc.
For 79, we write it as 50 + 20 + 9.
Step 2: Converting the number into Roman Numerals
50 in Roman Numerals — L
20 in Roman Numerals — XX
9 in Roman Numerals — IX
Step 3: Combine them into Roman Numerals.
Therefore, 79 in Roman Numerals is L (50) + XX (20) + IX (9) = LXXIX
When writing a number into Roman Numerals, we group the number.
To write 79 in Roman Numeral, we group 79 as 50 + 20 + 9.
50 in Roman Numerals — L
20 in Roman Numerals — XX
9 in Roman Numerals — IX
So, 79 is written as LXXIX 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 ways to avoid them.
A historian is transcribing ancient texts and finds that a king ruled for LXXIX years. If the king began his reign in the year MXC, in what year did his reign end?
The reign ended in the year MDCLXIX.
To find the end year of the king's reign, add the duration of the reign to the start year:
Start year: MXC = 1090
Reign duration: LXXIX = 79
End year: 1090 + 79 = 1169
1169 in Roman Numerals is MDCLXIX.
A treasure chest contains CLVIII gold coins, which are to be equally distributed among II groups of explorers. How many coins does each group receive?
Each group receives LXXIX coins.
To find out how many coins each group receives, divide the total number of coins by the number of groups:
Total coins: CLVIII = 158
Number of groups: II = 2
Coins per group: 158 / 2 = 79
79 in Roman Numerals is LXXIX.
Calculate the sum of XL and LXXXIX using Roman numerals.
The sum of XL and LXXXIX is CXXIX.
To find the sum, first convert the Roman numerals to numbers and then add them:
XL = 40
LXXXIX = 89
40 + 89 = 129
129 in Roman Numerals is CXXIX
Two ancient scrolls were discovered, one marked LV and the other marked with a numeral indicating the difference between the two scrolls as XXIV. What numeral is marked on the second scroll?
The numeral marked on the second scroll is LXXIX.
The difference is given as XXIV:
First scroll: LV = 55
Difference: XXIV = 24
Second scroll: 55 + 24 = 79
79 in Roman Numerals is LXXIX.
Write the Roman Numeral for the total number of pages, LXXIX, and XXXII, using the expansion method.
The Roman numeral for the total pages is CXI.
First convert the numbers to Roman numerals:
LXXIX = 79
XXXII = 32
Add the numbers together: 79 + 32 = 111
Using expansion method: 111 = 100 + 10 + 1 = CXI.
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.