Their are two types of number systems. 1. Non positional number systems 2. Positional number systems.

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carat and millesimal system

There was nothing wrong with theGreekand Roman numbering systems. They were complicated. They have beenreplacedby the Arabic numeral system because it is much easier to use.

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If you use windows calculator click on view and select scientific. Then you too will be able to easily convert between numbering systems.

Alternately you could learn the different numbering systems (binary, decimal, octal and hexadecimal) as this proves most useful when programming.