For essentially the same reason that number systems evolved anywhere else. People either adopted an existing system or invented their own.
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In the number system , there are decimal numbers, fractions,rational numbers , irrational numbers , negative and positive numbers.-0.567 on the number system is negative number.
15 in the hexadecimal number system is represented by 21 in the decimal system.
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11b = 3d
An irrational number, an imaginary number, a complex number, a quaternion.