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The origin of the **numbers** is very old and arose by the necessity that had the man to **count**.
Getting to **write the numbers** as we do now it was not far from easy.
At first, they counted on the fingers, with stones, doing wood marks or knots in a cord.

Almost all the systems of the old civilizations represented

The system that we used, DECIMAL SYSTEM, was invented by the Indians and brought to Europe by the Arabs. Its great success consisted of introducing the

Numbering Systems | |

Egyptian | Babylonian |

Greek | Chinese |

Besides the **zero**, another very important innovation of our system of numeration it is that each **number or digit**
has a value **according to the place** that occupies.

It is necessary to know very clearly what they which means the concept of **Units, Tens, Hundreds** and to know the value that represents.

**Units:** First number beginning by the right; its value is the one of the digit that occupies that place.

**Tens:** Second number beginning by the right. Each ten is 10 units, therefore, its value is the one of the digit that occupies that place multiplied by 10.

**Hundreds:** Third number beginning by the right. Each hundred is 100 units, therefore, its value is the one of the digit that occupies that place multiplied by 100.

The numbers can be written with numbers or letters. In order to write them with letters we will consider the following criteria:

The ** units** are written with the name of the digit that represent: one, two, three, four, five, six, seven, eight and nine.

The

The

In order to read a number with many digits, first that we will do it will be to separate

After the first group we put a

Traditional: 23 **.** 215 _{2} 312 **.** 107 _{1} 640 **.** 115

Present: 23** ** 215 312 107 640 115

one hundred fifteen.

In the games will continue using, at the moment, the point to separate thousands.

The games in the menu will help you learn the numbers.