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Here are the sets of numbers with which you should be familiar. Any set inside a larger box is completely contained within that set. You can click on any set name to see an explanation of which kind of numbers it contains, and some examples.

REAL NUMBERS (R)
Rational Numbers (Q)
Integers (I)

Negative Integers



Whole numbers (W)


Other Fractions & Decimals

repeating or terminating decimals    

Irrational Numbers

     a number that cannot be written as the quotient of two integers

  it is non-repeating and non-terminating




IMAGINARY NUMBERS



Real & Imaginary numbers form the set of Complex numbers (C).

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