Transformati in unitatile principale de masura pentru:
a)lungime:4000km,4000dm,4000cm,4000mm
b)arie:20km²,20ha,20ar,20dm²,20mm²
c)volum:5km³,5000dm³500000cm³
d)capacitate:8000ml,800ml,80ml,8ml
e)masa:70t,70q,70g,70mg
f)timp:300min,3ore