990 in Roman Numerals

Royal titles often use Roman numerals, such as Henry I, Henry II, etc. Have you ever wondered what these symbols represent? They are Roman Numerals. In ancient times, people counted using fingers, sticks, bones, etc. As life became more complex, a standard system was needed.

Ancient Romans developed the Roman Numeral system to count. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols used. In Roman Numerals, we use CMXC to represent 990. Here, CM is 900 (1000 - 100) and XC is 90 (100 - 10).

Let’s learn more about Roman numerals and how we write them.

There are 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 numeral is placed after a larger numeral. For example, VI → V + I → 5 + 1 = 6

Rule 2: Repetition Method

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

Rule 3: Subtraction Method

If a smaller numeral precedes a larger numeral, we subtract the smaller from the larger. For example, CM → M - C → 1000 - 100 = 900

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 don't write VV for 10; instead, we use X.

Let’s now learn how to write 990 in Roman Numerals. Follow these methods to write the number in Roman Numerals.

• By Expansion Method
• By Grouping Method

In the expansion method, the number is broken down based on its place value. In this section, we will learn how to write 990 in Roman numerals using the expansion method. To write 990 in Roman Numerals, follow the steps:

Step 1: Break the number based on place value—ones, tens, hundreds, etc. For 990, we write it as 900 + 90.

Step 2: Convert each part into Roman Numerals.

• 900 in Roman Numerals - CM
   
• 90 in Roman Numerals - XC
   

Step 3: Combine the Roman Numerals together. Therefore, 990 in Roman Numerals is CM (900) + XC (90) = CMXC

When writing a large number in Roman Numerals, we group the number. To write 990 in Roman Numerals, group 990 as 900 + 90.

• 900 in Roman Numerals - CM
   
• 90 in Roman Numerals - XC

So, 990 is written as CMXC 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 990. 

• Addition rule: Addition is used when a larger numeral is followed by a smaller one. For example, XI = X + I = 10 + 1 = 11.
   
• Grouping method: Group the numbers based on place value, then convert each group into Roman numerals. For example, 990 = 900 + 90 = CMXC.
   
• Repetition rule: Symbols like I, X, C, M can repeat up to three times. For example, XXX = 30 (X repeated three times).
   
• Subtraction method: Used when a smaller numeral precedes a larger one. For example, IX = X - I = 10 - 1 = 9.
   
• Symbol limitation: Symbols like V, L, and D cannot be repeated. For example, VV is not used for 10; X is used instead.