# The number “IV” is what?

The Roman numeral for the number four is “IV.” The letters “I” and “V” used in Roman numeral notation correspond to the Hindu-Arabic number one and the number five, respectively. There are still some apps using this numbering scheme in the world.

## How do Roman numerals work?

The ancient Romans’ system of counting included Roman numerals. They used letters to represent numerals rather than the modern standard of numbers. For nearly two millennia throughout the Middle Ages, this served as the accepted number notation throughout Europe before switching to the Hindu-Arabic system.

The Hindu-Arabic numbers 1, 5, 10, 50, 100, 500, and 1000 are replaced in this numerical system by the symbols I, V, X, L, C, D, and M. When a bar is put over these symbols, the greater numbers they represent become visible. A bar over the word X, for instance, designates the number 10,000. Since Arabic mathematicians invented this system, there is no sign for zero in it.

## Roman numerals: Standard vs. Alternative Forms

Each number in the traditional Roman numeral system has a set value. The standard principles for adding and subtracting from the letter combinations must be followed. Roman numerals can also be written by adding symbols collectively. For instance, IX is the customary Roman numeral for the number nine.

Roman numerals came in a variety of forms in addition to the conventional one, some of which broke some of the laws. For instance, it’s not unusual to see 9 written as XIIII rather than IX. The letters V and L are omitted in another variant. Then, the number five is represented by the letters IIIII.

## Roman numerals in Today’s World

In the fourteenth century, Roman numerals were no longer used in daily life as the more useful Hindu-Arabic numbering system gained popularity. Roman numerals are still widely used in various fields, such as royal titles, watches, clocks, architecture, and entertainment. Musicians use Roman numerals to denote major and minor triads, and publishers occasionally use them to divide chapters in books.

## Calculating with Roman numerals

When adding and subtracting Roman numerals, it’s crucial to keep the letter positions in mind. You add the numbers when a letter follows a bigger or equal sign. As an illustration, in the combination VI, I has a lower value than V. Next, you multiply one by five to arrive at six. For subtraction, the opposite is true. Nine is IX. You deduct one from ten, which equals nine, because the value of I is smaller than the value of X.

## How to Use a Conversion Tool for Roman Numbers

It can be difficult to sort through the numbers to add and subtract them. People may then use a Roman numeral conversion tool to perform the calculations automatically. They input the Roman numerals and allow the application to translate them into more easily understood Hindu-Arabic numbers.