Any number that ca be expressed as a finite or infinite decimal is a real number.
3, 1/7, -2.65, pi, sqrt(37) are all real numbers.
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The additive inverse of a real number is the number that when added to it equals zero, the identity element for addition. That is, the additive inverse of any real number x is -x.
A real number
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A real world example of what? Math in general? Geometry nets? Name the math concept and it'll be easier for readers to give you a real world example.
0 is a real number.