IV in Roman Numeral

In IV , I stand for 1 and V stands for 5. When you put I before V, it means you subtract 1 from 5, which equals 4. So, IV stands for 4 in Roman Numerals.
 

Rule 1: Addition Rule

Addition of two numerals i.e., greater and smaller numeral. For example, I (1) plus II (2) makes III (3).

Ⅰ + Ⅱ = Ⅲ    or    1 + 2 = 3

Rule 2: Repetition Rule

Repetition of numerals cannot be done more than thrice, and then the number is added. This is known as the repetition method. For example, II is 2, and III is 3, but you can't do this for 5.

Ⅱ is 2 correct

Ⅲ is 3  correct

ⅡⅢ is not 5  wrong

Rule 3: Subtraction Rule

Subtraction of the smaller number from the larger number, and the larger numeral is written after the smaller numeral.

Ⅴ - Ⅰ = Ⅳ    or    5 - 1 = 4

Rule 4: Limitation Rule

We add or subtract numbers to obtain the desired numbers, as the same symbol cannot be repeated more than 3 times. For example, you can't write IIII for 4; instead, use IV.

Ⅲ  correct

ⅡⅡ wrong

Ⅳ  correct

In roman numerals, we write 4 as IV.to get the desired number, we use subtraction and addition rule and combine them. We write roman numerals in methods explained below:

• Expansion method

• Grouping method

This method includes breaking down numbers based on their place values like thousands, a hundred, tens, and ones respectively. Every place value is written in the form of roman numerals.

This method works as shown below:

• Expand and part down the numbers into place values.

• Change the place values of numbers into roman numerals.

• Join the roman numerals to get the desired value.

• So, when you combine them, 4 in the Roman Numeral is written as IV.

This method involves breakdown of large numerals into small parts based on their Roman numeral values. This method works as follows:

• Identify symbols: Look for roman numerals that should be added or subtracted together according to addition and subtraction rules, as discussed.

• Breaking down larger numbers into smaller ones.

• Add or subtract values of the smaller numerals.

• So, while you can group four 1s as IIII, the best way to write 4 is IV.

Here are some of the numbers that are related to 4 in Roman Numerals

VI - 6 (the “I” is added to V)

III - 3 (three I’s before the 4)

V - 5 (the base for 4)

II - 2 (two I’s leading to 4)

VII - 7 (adding I to V)

VIII - 8 (adding more I’s to V)
 

• Addition Method: Add the greater and smaller numerals, where the larger number follows the smaller one(e.g., II + I = III).

• Subtraction Method: Subtract the smaller number from the larger number. Here, the larger numeral is written after the smaller numeral.

• Repetition Method: A numeral cannot be repeated more than thrice, the number is added. This is known as the repetition method.  (e.g., II = 2, III = 3).