Explicație pas cu pas:
a) 4 dam = 40 m
40 m + 13m = 53m
b) 2 km = 2000 m
2 dam = 20 m
2000m + 20m = 2020m
c) 20km = 20000m
7 dam = 70 m
20000n+70m= 20070m
d) 300dm = 30m
200 cm = 2m
30m+2m=32m
e) 120dm =12m
3000mm = 3m
12m + 3m = 15m
f) 20dm = 2 m
500 cm = 5m
2m + 5m =7m