In mathematics rational means "ratio like." So a
rational number is one
that can be written as the ratio of two integers.
For example 3=3/1, -17,
and 2/3 are rational numbers.
numbers (points on the number-line)
are irrational (not rational). The rational numbers are those which have
repeating decimal expansions (for example 1/11=0.09090909..., and
1=1.000000...=0.999999...). They are also those which have terminating continued
fraction expansions. Finally, the real number x is rational if and only if
there are finitely many solutions to |x - a/b| <
See Also: IrrationalNumber, AlgebraicNumber