#math The `rational numbers` $\mathbb{Q}$ is a [[1A4 - Fields|field]] defined by $ \left\{ \frac{p}{q} : p,q\in \mathbb{Z},q\neq{}0\right \}. $ Due to the existence of irrational numbers such as $\sqrt{2}$, we know there exist holes in the rational number line where this value ought to be. Every terminating decimal is rational — simply multiply the terminating value, $x$, by $\frac{10^{n}}{10^{n}}$ where $n$ is the number of trailing digits in $x$ then the numerator and denominator will both be integers and hence $x$ is rational.