Last updated on May 26th, 2025
Roman numerals are a way of expressing numbers using symbols: I, V, X, L, C, D, and M. They are used in various contexts such as royal titles, book names, and sequences. Here, we will discuss Roman numerals, their rules, and examples.
Roman numerals are symbols like I, V, X, L, C, D, and M used for counting. They were adopted by the ancient Romans as a standard way to represent numbers. For example, in royal titles, Henry I, Henry II, and so on, these symbols represent numbers. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the basic symbols.
In Roman numerals, we use DCCCX to represent 810, where D is 500, CCC is 300, and X is 10. Let’s learn more about Roman numerals and how to 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. For example, DCCCX → D + CCC + X → 500 + 300 + 10 = 810.
Rule 2: Repetition Method
Some Roman numerals can be repeated up to three times to increase the value. For example, CCC → 300.
If a smaller number precedes a larger number, the smaller is subtracted from the larger. For example, IX → X - I → 10 - 1 = 9.
Symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we use L for 50 and not XXXXX.
Let’s now learn how to write 810 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 810 in Roman numerals using the expansion method.
To write 810 in Roman numerals, follow these steps:
Step 1: Break the number based on the place value. For 810, we write it as 800 + 10.
Step 2: Convert the number into Roman numerals.
Step 3: Combine the Roman numerals together. Therefore, 810 in Roman numerals is DCCC (800) + X (10) = DCCCX.
When writing a large number in Roman numerals, we group the number. To write 810 in Roman numerals, we group 810 as 800 + 10.
So, 810 is written as DCCCX in Roman numerals.
Students often make mistakes when writing numbers in Roman numerals. To master Roman numerals, we can learn a few common mistakes and ways to avoid them.
A historian finds a scroll that references DCCCX and wants to convert it to modern numerals. What is DCCCX in Arabic numerals?
DCCCX is 810 in Arabic numerals.
Roman numerals are translated to Arabic numerals by summing the values.
D = 500, CCC = 300, and X = 10.
500 + 300 + 10 = 810.
So, DCCCX is 810.
An architect has a blueprint showing a wall length of DCCCX centimeters. How many meters is the wall?
The wall is 8.10 meters long.
To convert centimeters to meters, divide by 100.
DCCCX is 810 in Arabic numerals.
810 cm ÷ 100 = 8.10 meters.
So, the wall is 8.10 meters long.
A collector has a coin marked DCCCX and another marked CC. What is the total value of the coins in Roman numerals?
The total value of the coins is MX.
Convert DCCCX and CC to Arabic numerals:
DCCCX = 810
CC = 200
810 + 200 = 1010
1010 in Roman numerals is MX.
So, the total value is MX.
A puzzle requires the player to subtract CXLV from DCCCX. What is the result in Roman numerals?
The result is DCLXV.
First, convert the Roman numerals to Arabic numerals:
DCCCX = 810
CXLV = 145
810 - 145 = 665
665 in Roman numerals is DCLXV.
The result of the subtraction is DCLXV.
If a book references a chapter titled "DCCCX AD" and another titled "MCC," what is the difference in years between the two chapters?
The difference is MCCCX years.
First, convert the Roman numerals to Arabic numerals: DCCCX = 810 MCC = 1200 1200 - 810 = 390 390 in Roman numerals is CCCXC. So, the difference in years is CCCXC.
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.