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Parents 
number 
A measure of how many things there are, or how much there is, of a certain kind. Numbers are subclassed into RealNumber, ComplexNumber, and ImaginaryNumber.

Children 
binary number  Elements from the number system with base 2. Every BinaryNumber is expressed as a sequence of the digits 1 and 0. 
 irrational number  Any RealNumber that is not also a RationalNumber. 
 negative real number  A RealNumber that is less than zero. 
 nonnegative real number  A RealNumber that is greater than or equal to zero. 
 rational number  Any RealNumber that is the product of dividing two Integers. 