\begin{definition}[Definition:Decimal Expansion/Size Less than 1]
A number $x$ such that $\size x < 0$ has a units digit which is zero.
Such a number may be expressed either with or without the zero, for example:
:$0 \cdotp 568$
or:
:$\cdotp 568$
While both are commonplace, the form with the zero is less prone to the mistake where decimal point is missed when reading it.
\end{definition}