Răspuns:
Explicație pas cu pas:
a) 4 m = 40 dm = 4 000 mm = 400 cm = 4 m
8 km = 800 dam = 80 hm = 8000 m = 8 km
90 hm = 90000 dm = 9000 m = 900 dam
b) 5 000 dam = 50 km = 500 hm = 500 hm = 500000 dm
30 000 dm = 30 hm = 300 dam = 3000 m = 3 km = 30000 dm
700 000 cm = 700 dam = 7 km = 70 hm = 7000 m = 700 dam