Explicație pas cu pas:
a) 180dam+320dam=500dam=5000m
1000m = 100 dam => 100dam-50dam=50dam
6*250dam=1500dam=150hm
b) 4m=40dm => 40dm+32dm=72dm
30dm=3m => 42m-3m=39m
6*220dm=1320dm=132m
c) 17dm=170cm => 170cm+19cm=189cm
70cm=7dm => 415dm-7dm=408dm
800mm:2=400mm=40cm.
Sper că v-am ajutat