Răspuns :
315m=3150dm=31500cm=315000mm
3m=300cm
3dam=300dm
3dam=300cm
400m=4hm
400dam=4km
400m=4000dm
420km=42hm=42000dm=4200m
3m=300cm
3dam=300dm
3dam=300cm
400m=4hm
400dam=4km
400m=4000dm
420km=42hm=42000dm=4200m
1. 315m=31,5dm=3,15cm=0,315mm 2.3m=0,03cm 3.3dam=3000cm 4. 400m=40000hm 5. 400dam=40000km 6. 3dam=300dm 7. 400m=40dm 8. 420km=42hm=0,0042dm=0,042m