145 in Roman Numerals

The royal titles, such as Henry I, Henry II, and so on, use Roman numerals. Have you noticed the names and wondered what these symbols (I and II) represented? Those are Roman numerals.

Earlier, people used fingers, sticks, bones, etc., to count. When life became complex, a standard form was required to count. Ancient Romans used the Roman numeral system for this purpose. 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 CXLV to represent 145, where C is 100, XL is 40, and V is 5. Let’s learn more about Roman numerals and how we write them.
 

CXL = 100 + 40 = 140 CXLI = 100 + 40 + 1 = 141 CXLII = 100 + 40 + 2 = 142 CXLIII = 100 + 40 + 3 = 143 CXLIV = 100 + 40 + 4 = 144 CXLV = 100 + 40 + 5 = 145 

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, XV → X + V → 10 + 5 = 15.

Rule 2: Repetition Method

To write a larger number, certain 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, XL → L - X → 50 - 10 = 40.

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 don't write CCCCC for 500; instead, we use D.

Let’s now learn how to write 145 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 place value, the number is broken down. In this section, we will learn how to write 145 in Roman numerals using the expansion method.

To write 145 in Roman numerals, follow the steps:

Step 1: Break the number based on place value. Place values include ones, tens, hundreds, etc.

For 145, we write it as 100 + 40 + 5.

Step 2: Convert the numbers into Roman numerals:

100 in Roman numerals — C
40 in Roman numerals — XL
5 in Roman numerals — V

Step 3: Combine the Roman numerals together.

Therefore, 145 in Roman numerals is C (100) + XL (40) + V (5) = CXLV.
 

When writing a large number into Roman numerals, we group the number. To write 145 in Roman numerals, we group 145 as 100 + 40 + 5.

100 in Roman numerals — C

40 in Roman numerals — XL

5 in Roman numerals — V

So, 145 is written as CXLV 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 145.

• Addition rule: The addition method is used when a larger numeral is followed by a smaller numeral, and their values are added. For example, XV = X + V = 10 + 5 = 15.

• Grouping method: Here, the given numbers are grouped based on their place value and then converted into Roman numerals. For example, 145 = 100 + 40 + 5 = CXLV.

• 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 one. For example, XL = L - X = 50 - 10 = 40.

• Limitation rule: Symbols cannot be repeated more than three times, and certain symbols (V, L, D) cannot be repeated at all.