900 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. As life became more 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 CM to represent 900, where C is 100 and M is 1000. 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, there are certain Roman Numerals that can be repeated three times. III → 3.

Rule 3: Subtraction Method

If a small number is placed before a large number in Roman Numerals, we subtract the smaller number from the large number. This is the subtraction method. For example, CM → M - C → 1000 - 100 = 900

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 DDD for 1500; instead, we use MD for 1500.

Let’s now learn how to write 900 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 900 in Roman numerals using the expansion method. To write 900 in Roman Numerals, follow the steps:

Step 1: The number is broken based on the place value, such as ones, tens, hundreds, etc. For 900, we write it as 1000 - 100

Step 2: Converting the number into Roman Numerals

• 1000 in Roman Numeral - M
   
• 100 in Roman Numeral - C

Step 3: Applying the subtraction method. Therefore, 900 in Roman Numeral is M (1000) - C (100) = CM

When writing a large number into Roman Numerals, we group the number. To write 900 in Roman Numeral, we group it as 1000 - 100

• 1000 in Roman Numeral — M
   
• 100 in Roman Numeral — C

So, 900 is written as CM 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 900. 

• Subtraction rule: This method is used when a smaller numeral precedes a larger numeral, indicating subtraction. For example, CM = 1000 - 100 = 900.
   
• Addition rule: The addition method is used when a larger numeral is followed by a smaller one, indicating addition. For example, VI = 5 + 1 = 6.
   
• Grouping method: Here, numbers are grouped based on their place value, and then each group is converted into its Roman numerals. For example, 900 = 1000 - 100 = CM.
   
• 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).
   
• Limitation rule: Some symbols like V, L, and D cannot be repeated in the Roman numeral system.