108 tiles at 500x500mm, how much does it make in square metres
It is easier if you change all the units to metres first.
0.5*0.5 m^2 each tile
Total = 0.5*0.5*108
$${\mathtt{0.5}}{\mathtt{\,\times\,}}{\mathtt{0.5}}{\mathtt{\,\times\,}}{\mathtt{108}} = {\mathtt{27}}$$
27 m^2
