Rational numbers

The rational numbers ( Q {\displaystyle \mathbb {Q} } ) are included in the real numbers ( R {\displaystyle \mathbb {R} } ), while themselves including the integers ( Z {\displaystyle \mathbb {Z} } ), which in turn include the natural numbers ( N {\displaystyle \mathbb {N} } )

A rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. The set of all rational numbers, also referred to as "the rationals", the field of rationals, or the field of rational numbers is usually denoted by a boldface Q (or blackboard bold  Q {\displaystyle \mathbb {Q} } , Unicode U+1D410 𝐐 MATHEMATICAL BOLD CAPITAL Q, or U+211A ℚ DOUBLE-STRUCK CAPITAL Q).[1]

## Lessons

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* Introduction
* Advanced Study

## See Also

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* Wikipedia: Rational number

## References

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1. ↑ Wikipedia: Rational number