Răspuns:
3 m + 20 cm = 300cm+20cm=320cm
70 km - 45 000 m = 70000m-45000=25 000 m
7 m + 400 cm = 700cm+400cm=1100m
500 cm-2 m = 500cm-200cm=300cm
3 m + 2 000 mm=3m+2m=5m
5 000 m + 7 km = 5km+7km=12km
8 m - 155 cm = 800cm-155 cm=645cm
900 cm - 370 mm = 900cm-37cm=863cm
980 hm + 78 000 m = 980hm+780hm=1760hm
8 x 35 hm= 280hm
8 m - 2450 mm = 8000mm-2450mm=5550mm
900 mm:5= 180mm