684 in Roman Numerals

The royal titles, such as Henry I, Henry II, and so on, use Roman Numerals. Earlier people used to count using fingers, sticks, bones, etc.

When life became complex, a standard form was required for counting. 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 write 684 as DCLXXXIV. 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, VI → V + I → 5 + 1 = 6.

Rule 2: Repetition Method

To write a large number, some Roman Numerals can be repeated. For example, III → 3.

Rule 3: Subtraction Method

If a small number precedes 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 VV for 10; instead, we use X, and 8 is written as VIII, not IIIIIIII.

Let’s now learn how to write 684 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 684 in Roman numerals using the expansion method. To write 684 in Roman Numerals, follow the steps:

Step 1: Break the number based on place value. Place values are ones, tens, hundreds, etc. For 684, we write it as 600 + 80 + 4.

Step 2: Convert the number into Roman Numerals:

• 600 in Roman Numeral - DC
   
• 80 in Roman Numeral - LXXX
   
• 4 in Roman Numeral - IV

Step 3: Combine the Roman Numerals together. Therefore, 684 in Roman Numerals is DC (600) + LXXX (80) + IV (4) = DCLXXXIV.

When writing a large number into Roman Numerals, we group the number. To write 684 in Roman Numerals, we group 684 as 600 + 80 + 4.

• 600 in Roman Numerals - DC
   
• 80 in Roman Numerals - LXXX
   
• 4 in Roman Numerals - IV

So, 684 is written as DCLXXXIV 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 684.

• Addition rule: The addition method is used when a large number is followed by a smaller numeral, where the values are added. For example, DC = D + C = 500 + 100 = 600.
   
• Subtraction rule: When a smaller numeral precedes a larger numeral, we subtract the smaller from the larger. For example, IV = V - I = 5 - 1 = 4.
   
• Expansion method: This method involves breaking down a number based on place value and converting each part into Roman numerals. For example, 684 = 600 + 80 + 4 = DCLXXXIV.
   
• Grouping method: Here, the given number is grouped based on its place value and then converted into its Roman numerals. For example, 684 = 600 + 80 + 4 = DCLXXXIV.
   
• 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 3).