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 discuss Roman Numerals, rules, and examples.
Royal titles, such as Henry I, Henry II, and so on, utilize Roman Numerals. Have you noticed these symbols and wondered what they represent? Those are the Roman Numerals.
In earlier times, people counted using fingers, sticks, bones, etc. As life became more complex, a standard form was required for counting. Ancient Romans used the Roman Numeral system for counting. 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 DCXX to represent 620, where D is 500, C is 100, and XX is 20. Let’s learn more about Roman numerals and how we write them.
There are certain basic rules for writing numbers 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, DCXX → D + C + X + X → 500 + 100 + 10 + 10 = 620.
To write a large number, certain Roman Numerals can be repeated up to three times. For instance, XX → 20.
If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number. For example, XC → C - X → 100 - 10 = 90.
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 DD for 1000; instead, we use M.
Let’s now learn how to write 620 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 620 in Roman numerals using the expansion method. To write 620 in Roman Numerals, follow these steps:
Step 1: Break the number based on the place value — ones, tens, hundreds, etc. For 620, we write it as 500 + 100 + 20.
Step 2: Convert the numbers into Roman Numerals.
500 in Roman Numeral - D
100 in Roman Numeral - C
10 in Roman Numeral - X
Step 3: Combine the Roman Numerals together. Therefore, 620 in Roman Numeral is D (500) + C (100) + X (10) + X (10) = DCXX.
When writing a large number in Roman Numerals, we group the number. To write 620 in Roman Numerals, we group 620 as 500 + 100 + 20.
So, 620 is written as DCXX in Roman Numerals.
Students make mistakes when writing numbers in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and how to avoid them.
Calculate the sum of DC and XX.
The sum of DC and XX is DCXX.
In Roman numerals, DC is 600 and XX is 20. Adding these together gives 600 + 20 = 620. 620 in Roman numerals is written as DCXX.
A historian has DCLXX ancient coins and wants to distribute them equally among X people. How many coins will each person receive?
Each person will receive LXVII coins.
To determine the number of coins each person receives, divide the total number of coins by the number of people:
DCLXX / X
DCLXX = 670
X = 10
Therefore, 670 / 10 = 67. 67 in Roman numerals is LXVII.
If a clock strikes every hour, starting from I AM to X PM, how many times does it strike in total?
The clock strikes LXXVIII times in total.
The clock strikes once at 1 AM, twice at 2 AM, and so on, up to 12 strokes at noon, and repeats the cycle until 10 PM.
Calculating the total strikes from 1 AM to 12 PM gives 1 + 2 + ... + 12 = 78.
From 1 PM to 10 PM (1 to 10) gives 1 + 2 + ... + 10 = 55. Adding both gives 78 + 55 = 133. 133 in Roman numerals is CXXXIII.
A Roman scroll has a total of DCXX lines. If you read XL lines per day, how many days will it take to finish reading the scroll?
It will take XVI days to finish reading the scroll.
To find the number of days required to read the scroll, divide the total number of lines by the number of lines read per day:
DCXX / XL
DCXX = 620
XL = 40
Therefore, 620 / 40 = 15.5. Rounding up gives 16 days. In Roman numerals, 16 is written as XVI.
Convert the subtraction of CCC from CMXL to Roman numerals.
The result of subtracting CCC from CMXL is DCXL.
First, convert the Roman numerals to numbers: CMXL = 940 CCC = 300 Subtract 300 from 940:
940 - 300 = 640.
640 in Roman numerals is DCXL.
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.