690 in Roman Numerals

The royal titles, such as Henry I, Henry II, and so on, have symbols that represent Roman numerals. Earlier people used to count using fingers, sticks, bones, etc. As 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 DCXC to represent 690, where D is 500, C is 100, X is 10.

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 a smaller number is placed after a larger number. For example, DCXC → D + C + X + C → 500 + 100 + 10 + 100 = 690

Rule 2: Repetition Method

To write a large number, some Roman numerals can be repeated up to three times. For example, CCC → 300.

Rule 3: Subtraction Method

If a small number is followed by a larger number in Roman numerals, we subtract the smaller number from the larger number. For example, XC → C - X → 100 - 10 = 90

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 DD for 1000 instead we use M.

Let’s now learn how to write 690 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 690 in Roman numerals using the expansion method. To write 690 in Roman numerals, follow the steps:

Step 1: The number is broken down based on place value. Place value includes ones, tens, hundreds, etc. For 690, we write it as 500 + 100 + 90

Step 2: Converting the number into Roman numerals

• 500 in Roman numerals - D
   
• 100 in Roman numerals - C
   
• 90 in Roman numerals - XC
   

Step 3: Combining the Roman numerals together. Therefore, 690 in Roman numerals is D (500) + C (100) + XC (90) = DCXC

When writing a large number into Roman numerals, we group the number. To write 690 in Roman numerals, we group 690 as 500 + 100 + 90 

• 500 in Roman numerals - D
   
• 100 in Roman numerals - C
   
• 90 in Roman numerals - XC

So, 690 is written as DCXC 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 690. 

• Addition rule: The addition method is used when a large number is followed by a smaller numeral; here, the values are added. For example, DCXC = D + C + XC = 500 + 100 + 90 = 690
   
• Grouping method: Here, the given numbers are grouped based on their place value and then converted into Roman numerals. For example, 690 = 500 + 100 + 90 = DCXC
   
• Repetition rule: Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, CCC = 300 (C is repeated three times to represent the number 300).
   
• Subtraction rule: The subtraction method is used when a smaller numeral precedes a larger numeral; here, the smaller value is subtracted from the larger. For example, XC = C - X = 100 - 10 = 90
   
• Place value: Roman numeral values are determined by their position and combination, such as in DCXC where D = 500, C = 100, and XC = 90.