# What Number Is “IV”?

The Roman numeral “IV” represents the number four. In Roman number notation, “I” corresponds to the number one in the Hindu-Arabic numbering system, whereas “V” corresponds to the number five. This numbering system is still utilised in several applications around the globe.

## How do Roman Numerals work?

Roman numerals were part of the ancient Romans’ numbering system. They used letters to symbolise numerals, as opposed to the numbers widely used nowadays. This was the traditional number notation in Europe during the Middle Ages, and it was used for about two millennia before the Hindu-Arabic system was adopted.

This numerical notation substitutes the Hindu-Arabic numbers 1, 5, 10, 50, 100, 500, and 1000 with the symbols I, V, X, L, C, D, and M. If a bar is placed above these symbols, they signify bigger numerals. A bar across the word X, for instance, represents the number 10,000. The absence of a zero symbol in this system is due to the contribution of Arabic mathematicians.

## Standard versus Alternative Roman Numeral Forms

Each number in the conventional form of Roman numerals has a defined value. The letter combinations must be added and subtracted in accordance with the standard standards. In an alternate form of Roman numerals, symbols are combined. IX represents the number nine in conventional Roman numeral system.

In addition to the normal form of Roman numerals, other forms existed that did not adhere to all of the standard criteria. For example, the number 9 is frequently written as XIIII instead of IX. Another variant form does not have the letters V and L. In this instance, the number 5 is represented as IIIII.

## Modern Applications of Roman Numerals

People ceased using Roman numerals in daily life during the fourteenth century, when the more efficient Hindu-Arabic numbering system gained popularity. Roman numerals are still commonly used in various contexts, such as royal titles, watches and clocks, structures, and entertainment. Roman numerals are used by publishers to separate chapters in books and by musicians to signify major and minor triads.

## Calculating Sums and Differences Using Roman Numerals

When adding and subtracting Roman numerals, it is crucial to take account of the letter positions. When a letter follows a larger or equal symbol, the numbers are added. In the combination VI, for instance, the value of I is less than the value of V. The result of adding one to five is six. The converse holds true for subtraction. IX is nine. Since the value of I is less than that of X, one is subtracted from ten, yielding nine.

## How to Use a Conversion Tool for Roman Numerals

Sometimes it is difficult to sort through the numbers in order to add and subtract them. People may then rely on a Roman numeral conversion tool to perform the necessary computations. The user enters a string of Roman numerals and the tool converts them into more recognisable Hindu-Arabic numerals.