820 in Roman Numerals

The royal titles, such as Henry I, Henry II, and so on, use Roman Numerals. Have you noticed these symbols (I and II) and wondered what they represent? Those are Roman Numerals. In ancient times, people used fingers, sticks, bones, etc., to count. As life became more complex, a standard form was needed, so the ancient Romans developed the Roman Numeral system. We use I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) as symbols to count.

In Roman Numerals, we use DCCCXX to represent 820, where D is 500, CCC is 300, and XX is 20. Let’s learn more about Roman numerals and how we write them.

Certain basic rules apply when writing a number in Roman Numerals. Let's discuss some rules that are important to remember:

Rule 1: Addition Method

The addition method is used when the smaller number is placed after the larger number. For example, DCCCXX → D + CCC + XX → 500 + 300 + 20 = 820

Rule 2: Repetition Method

Certain Roman Numerals can be repeated up to three times. For instance, III → 3.

Rule 3: Subtraction Method

If a smaller number precedes a larger number, you subtract the smaller from the larger. For example, IX → X - I → 10 - 1 = 9

Rule 4: Limitation Rule

Symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we write 10 as X, not VV, and 8 as VIII, not IIIIIIII.

Let’s learn how to write 820 in Roman Numerals using different methods.

• By Expansion Method
• By Grouping Method

In the expansion method, based on place value, the number is broken down. Here's how to write 820 in Roman numerals using this method:

Step 1: Break the number based on place value: hundreds, tens, ones. For 820, it's 800 + 20.

Step 2: Convert these numbers into Roman Numerals: 

• 800 = DCCC (500 + 300) 
   
• 20 = XX

Step 3: Combine them: DCCC + XX = DCCCXX.

When writing large numbers into Roman Numerals, we group the numbers. To write 820 in Roman Numerals, group 820 as 800 + 20.

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

Therefore, 820 is written as DCCCXX in Roman Numerals.

Roman Numerals follow a pattern that makes them similar. Here are some numbers related to the Roman numeral 820: 

• Addition rule: Applies when a large numeral is followed by a smaller numeral, resulting in addition. For example, DCCCXX = D + CCC + XX = 500 + 300 + 20 = 820.

• Grouping method: Numbers are grouped based on place value and converted to Roman numerals. For example, 820 = 800 + 20 = DCCCXX.

• Repetition rule: Certain symbols (I, X, C, M) can be repeated up to three times. For example, CCC = 300.

• Subtraction method: A smaller numeral before a larger one indicates subtraction. For example, IX = X - I = 9.

• Limitation rule: Symbols like V, L, and D cannot be repeated. For example, 10 is X, not VV.