$a)$  

$1km=1000m$  

 

$b)$  

$1h=60\min =60\cdot 60s=3600s$ $1h=60\min =60\cdot 60s=3600s$  

 

$c)$  

$100d{m}^3=100l$  

 

$d)$  

$1k{m}^2=1000000m^2$  

 

$e)$  

$1m^3=1000000c{m}^3$  

 

$f)$  

$1\text{hektolitr}=100\text{litroˊw}$  

 

$g)$  

$1ha=100a$