Răspuns :

1)6km,60hm,600dam,6000m,60000dm,600000cm,6000000mm.
2)2km,20hm,200dam,2000m,20000dm,200000cm,2000000mm.
3)9km,90hm,900dam,9000m,90000dm,900000cm,9000000mm.
4)7km,70hm,700dam,7000m,70000dm,700000cm,7000000mm.