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In classical numbers you have ten different figures, whereas in hexadecimal numbers you have 16 different figures.
Below are numbers from 0 to 15 in both systems:
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DEC | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15
| | HEX | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F
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The highest hexadecimal number you can specify using one figure is F equaling 15.
With two figures the highest value is FF equaling 255.
To prevent confusion on numbers higher than 9 hexadecimal colors are often entered with a # in front of them.
In HTML, color codes have 6 digits, like #FF3C96.
They are explained in detail on the following pages...
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