. In the decimal system these are the digits 0 to 9, in the hexadecimal system
the digits 0 to 9 and the letters A, B, C, D, E, F, inthe binary system
theyare the "0" and the "1".
A number is represented by several digits. In the case of longer numbers, they are grouped together and can be designated accordingly. The groups can be powers to the base of a number. Another group designation is based on the prefixes
, which represent the powers of ten using upper and lower case letters. For example, the number 1234000 can be represented as 1.234 x 10exp6 or as 1.234 million, whose prefix is the mega (M).