The numerical value of the ratio of displacement to distance is: 

Displacement can be equal to or less than distance. Hence their ratio can be equal to or less than one.

consider the example of a body motion along a semi circular path, displacement = 2(radius) and

 $$\begin{gathered} dis\tan ce = \mathrm{\pi }\left(\mathrm{radius}\right) \\ \mathrm{here} \frac{\mathrm{displacement}}{\mathrm{distance}}=\frac{2\mathrm{r}}{\mathrm{\pi r}}=0.64 \end{gathered}$$