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, use Roman Numerals. Have you noticed these 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 CMXX to represent 920, where CM is 900 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.
The addition method is used when the smaller number is placed after the larger number. For example, XX → X + X → 10 + 10 = 20.
To write a large number, certain Roman Numerals can be repeated up to three times. III → 3.
If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number. For example, CM → M - C → 1000 - 100 = 900.
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 VV for 10; instead, we use X.
Let’s now learn how to write 920 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 920 in Roman numerals using the expansion method. To write 920 in Roman Numerals, follow the steps:
Step 1: Break the number based on the place value. Place values are ones, tens, hundreds, etc. For 920, we write it as 900 + 20.
Step 2: Converting the number into Roman Numerals:
Step 3: Combining the Roman Numerals together: Therefore, 920 in Roman Numeral is CM (900) + XX (20) = CMXX.
When writing a large number into Roman Numerals, we group the number. To write 920 in Roman Numerals, we group 920 as 900 + 20.
So, 920 is written as CMXX in Roman Numerals.
Students often 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 discovers a scroll that mentions a battle involving CMXX soldiers. If each soldier was armed with III weapons, find the total number of weapons used in the battle.
The total number of weapons used in the battle is MMMDCLX.
Each of the CMXX soldiers had III weapons.
Thus, the total number of weapons is calculated as CMXX × III.
CMXX = 920
III = 3
920 × 3 = 2760
2760 in Roman numerals is MMMDCLX.
An ancient architect designed a building with CMXX columns, and each column supports X floors. Calculate the total number of floors supported by these columns.
The total number of floors supported by the columns is IXCC.
To find the total number of floors, multiply the number of columns by the number of floors each supports.
CMXX = 920
X = 10
920 × 10 = 9200
9200 in Roman numerals is IXCC.
A museum has CMXX artifacts equally distributed across XX exhibits. Determine the number of artifacts per exhibit.
Each exhibit has XLVI artifacts.
To find the number of artifacts per exhibit, divide the total number of artifacts by the number of exhibits.
CMXX = 920
XX = 20
920 / 20 = 46
46 in Roman numerals is XLVI.
A library has CMXX books. If they acquire an additional CC books, how many books will they have in total?
The library will have MCLXX books in total.
To find the total number of books, add the number of additional books to the original number of books.
CMXX = 920
CC = 200
920 + 200 = 1120
1120 in Roman numerals is MCLXX.
Write the Roman Numeral for 920 - 45 using the subtraction method.
The Roman numeral for 920 - 45 is DCCCLXXV.
Step 1: Convert the numbers 920 and 45 to Roman numerals.
920 - CMXX
45 - XLV
Step 2: Subtract the numbers: 920 - 45 = 875
875 in Roman numerals is DCCCLXXV.
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.