1 Exa metre =

1 mg / km = _____ μg / mm.

1 μs / nm = _____ ms / km.

Which of the following are called hand units?

80 kilogram in short form is written as 

In which physical quantity, unit is same in all systems? 

$20c{m}^2=20\; \backslash ,cm\; ^2\; =$ ______ $k{m}^2\mathrm{.}km\; ^2.$

The area of the town is 20 hectare, then the area in $k{m}^{2}km^2$ is

$1k{m}^2=1\backslash ,km\; ^2\; =$ _____ $m^2\mathrm{.}m^2.$

Area of rectangle is