A rational number is any number that can be expressed as the ratio between two integers; i.e. by division or as a fraction. In this case:
[tex]3.142857=\frac{3,142,857}{1,000,000}[/tex]
Be careful here. [tex]\frac{3,142,857}{1,000,000}[/tex] is very close to [tex]\frac{22}{7}[/tex] (a common approximation for pi) but [tex]\frac{22}{7}[/tex] does not terminate, it repeats while 3.142857 does terminate. Both are rational but they are not equal.
