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Efectueaza:
a) 9 dam+69m=........m;
4hm+5dam=........dam;
9hm+63dam=.........cm;
75dam+130km=........m;
430m+60m=..........dam;

b) 72dam-140m=........m;
9km-9hm=...........dam;
1870dam-21hm=.........hm;
630cm-120mm=.........mm;
570m-1600dm=..........cm;
21km-18dam=...........dm.
Dau COROANA!!



Răspuns :

a) 9 dam+69m=90 m+69m=159m;
4hm+5dam=40dam+5dam=45dam;
9hm+63dam=900000cm+63000=963000cm;
75dam+130km=750m+130000m=130750m;
430m+60m=43dam+6dam=49dam;

b) 72dam-140m=720-140m=580m;
9km-9hm=900dam-90dam=810dam;
1870dam-21hm=187hm-21hm=166hm;
630cm-120mm=6300mm-120mm=6180mm;
570m-1600dm=57000cm-16000cm=39000cm;
21km-18dam=210000dm-1800dm=208200dm.