Transformati in unitatile principale de masura pentru:
a)lungime:4000km,4000dm,4000cm,4000mm;
b)arie20km patrati,20 ha(hectare),20ari,20dm patrati,20mm patrati;
c)volum:5km cubi,5000dm cubi,500 000cm cubi ;
d)capacitate:8000ml,800ml,80ml,8ml;
e)masa:70t.(tone),70 g,70mg;
f)timp:300min.,3 ore