Definitions

# What is Roman Numbers definition/concept

The Roman numeral system is internationally known and is based on seven letters that refer to numbers. Nowadays they are not used very often, they are only used to write dates or in the  context of the classic clock. They can also be found in the  writing of certain monuments, to indicate a new book chapter or in relation to official events, for example, in reference to an edition of the  Olympic Games .

### The Roman Number System

Each of the seven letters has a numerical value. Thus, the letter L is equivalent to 1; the letter V to 5; the letter X to 10 and more that will be shown below.

### Rules for writing Roman numbers

The rules for using this numbering are as follows:

1) According to the sum rule, a letter written to the right of another letter of equal or greater value will be added, for example, LX is equal to 10 + 1 = 11 and CXV is equal to 100 + 10 + 5 = 115. Roman Numbers

2) In the subtraction rule, the letters L, X and C to the left of a higher valued one will be subtracted, for example, LX is the same as 10 – 1 = 9; XC is the same as 100 – 10 = 90 and CD is equal to 500 – 100 = 400.

3) In the repetition rule the letters L, X, C and M can be written a maximum of three times, for example, CCC is equal to 100 + 100 + 100 = 300.

4) In the multiplication rule, a streak on top of a letter or a group of letters multiplies its value by 1000.

### The Origin of Roman Numbers

Humans began to  count out of necessity , especially in commercial activity, so they used their fingers and stones as if they were numbers to calculate. The first written records of Roman numbers date back to the 2nd century AD It is believed that the authentic inventors were not the Romans, but the Etruscans, a people who inhabited northern Italy today and were eventually subjugated by the Romans. Roman Numbers

### Other numbering systems

There are several numbering systems and from a historical point of view we can highlight the Egyptian numbering, the Indo-Arabic system, the Mayan numbering and the current binary system.

Anyway, numbers are an abstraction of the mind that allows you to have control of reality .