Page 7 - Matematica_Mathematics - Numere naturale_Natural numbers

Practice

1. Write in Arabic numbers the following:

II - IV - XIX - XII - XXI - L -

XL - CI - CCL - CD - CMXX -

2. Write in Roman numbers the following:
14 - 29 - 46 - 94 - 123 -

478 - 616 - 945 -

888 - 2 022 -

As you will see at page 35, at History chapter,
Indians where the ones who invented the numbers that
we use, somehow unfair called arrabic. The arabians just
brought them to Europe.
The Arabic system (“Sistemul arabic”) which we
also use, is based on 10 symbols, respectively the digits
0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. With their help we can write
any number we want and that is great. Our system
of representing all possible numbers, however large,
through the 10 digits is a relatively recent invention: it
appeared about 1500 years ago.
The string of natural numbers starts from 0,
continues with 1, 2, 3, 4 and it is endless, that is infinite. It is believed that the value of each arab number is
The value of a digit depends on the position it represented by the number of angles.
occupies in a number. The digit 4 of the numbers 4, 40,
400 or 4 000 has different values.

Practice

3. Write in Arabic numbers:

nine thousand and two - eighty thousand and eight -

fifteen thousand eight hundred and thirty-nine -

The numbers are divided into classes: the class of millions, thousands and units are already known to
you. Each class has 3 orders: hundreds, tens and units.
The number 204 115 947 is read 204 million 115 thousand 947.

Practice

4. Do you know how to read the numbe 324 001 085?