821 in Roman Numerals

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 earlier. 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 DCCCXXI to represent 821, where D is 500, CCC is 300, XX is 20, and I is 1. 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.

Rule 1: Addition Method

The addition method is used when the smaller number is placed after the larger number. For example, DCCCXXI → D + CCC + XX + I → 500 + 300 + 20 + 1 = 821

Rule 2: Repetition Method

To write a large number, there are certain Roman Numerals that can be repeated three times. III → 3.

Rule 3: Subtraction Method

If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number. For example, IX → X - I → 10 - 1 = 9

Rule 4: Limitation Rule

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 VVV for 15; instead, we use XV.

Let’s now learn how to write 821 in Roman Numerals. Follow these methods to write the number in Roman Numerals.

• By Expansion Method
• By Grouping Method

In the expansion method, based on the place value, the number is broken down. In this section, we will learn how to write 821 in Roman numerals using the expansion method.

To write 821 in Roman Numerals, follow the steps,

Step 1: The number is broken based on the place value. Place values are ones, tens, hundreds, etc. For 821, we write it as 800 + 20 + 1

Step 2: Converting the number into Roman Numerals

• 800 in Roman Numerals - DCCC
   
• 20 in Roman Numerals - XX
   
• 1 in Roman Numerals - I

Step 3: Combining the Roman Numerals together. Therefore, 821 in Roman Numerals is DCCC (800) + XX (20) + I (1) = DCCCXXI

When writing a large number into Roman Numerals, we group the number. To write 821 in Roman Numerals, we group 821 as 800 + 20 + 1

• 800 in Roman Numerals - DCCC
   
• 20 in Roman Numerals - XX
   
• 1 in Roman Numerals - I

So, 821 is written as DCCCXXI in Roman Numerals.

Roman Numerals follow a certain pattern, making them look similar. In this section, we will learn some numbers related to the Roman numeral 821 

• Addition Rule: The addition method is used when a large number is followed by a smaller numeral, and the values are added. For example, DCCCXXI = DCCC + XX + I = 800 + 20 + 1 = 821

• Grouping Method: Here, the given number is grouped based on its place value, and then we convert each group into its Roman numerals. For example, 821 = 800 + 20 + 1 = DCCCXXI

• Repetition Rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, III = 3 (I is repeated three times to represent the number 3).

• Subtraction Rule: The subtraction method is used when a smaller numeral precedes a larger numeral. For example, IV = V - I = 5 - 1 = 4

• Limitation Rule: Roman numeral symbols cannot be repeated more than three times, and symbols like V, L, and D cannot be repeated at all.