A cube has a side of length 1.2 x 10^-2.Calculate its volume

Volume of cube = $={\mathrm{l}}^3={\left(1\cdot 2\times {10}^{-2}\right)}^3$
$=1\cdot 728\times {10}^{-6}{\mathrm{m}}^3$
Minimum number of significant figures in 1.2 x 10² is two and hence in the product the significant figures should be two.
Hence, the volume of cube is 1.7 x 10^{- 6} m³.