Why do we need Number system & Numbering schemes ?

I mean ,if we can do all calculations in decimal number system then what is the need of other numbering schemes like:
1.Roman
2.Hexa-decimal
3.Binay
4.Octal

Anonymous2012-02-09T18:30:07Z

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Since you know all the calculations in decimal system, you can use the same techniques to work in any other system.

Computers work in binary, even if you don't see it.
Since they use lots of 0s and 1s, it's good if you simplify the interaction and use hexadecimal for some applications, for example software programming.

Roman... well, it's part of the human history.