# Binary numbers, what are they?

Published:# Binary numbers, what are they?

You may have heard about binary numbers and how they are used in computing. But after all, what are they?

In our day-to-day life we use the Hinduâ€“Arabic numeral system, which uses **ten** digits to represent the numbers from zero to nine: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ( that's why we say it's a base 10 system ).

Also the position of the digit determines its contribution to the value of the number ( that's why we say it's a positional system ).

The binary system works exactly the same, but instead of ten digits **it uses only two: 0, 1**.

Lets count to ten in binary:

0 : zero

1: one

10: two

11: three

100: four

101: five

110: six

111: seven

1000: eight

1001: nine

1010: ten

## Hexadecimal numbers

There are other bases in computing, one of them is the base sixteen or "hexadecimal", which uses sixteen digits to represent the numbers from zero to fifteen: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.

### Wait, what?

It is simple, really:

0 : zero

1: one

2: two

3: three

4: four

5: five

6: six

7: seven

8: eight

9: nine

**A: ten**

B: eleven

C: twelve

D: thirteen

E: fourteen

F: fifteen

**10: sixteen**

11: seventeen

12: eighteen

13: nineteen

14: twenty