11m+4dam=11m+40 m=51m
172km+600dam=172km+6km=178km
75dam+160m=750 m+160m=910m
9km-200dam=90hm-20hm=70 hm
15hm-410m=150 dam-41dam=109dam
108m-52000mm=108 m-52 m=56 m
1dam-280cm=100 dm-28dm=72dm
3*6km=36km=360hm
300dam:3=100 dam=1000m
522km:9=58 km=58000m
7*40dm=280 dm=28m
700cm-70mm=700cm-7cm=693cm
980dam-90m=980 dam-9dam=971dam
2)7dm+?cm=7dm+30cm=1m
60cm+?dm=60cm+4dm =1m
40cm+?mm=40 cm+600mm=1m
6dm+40cm=6dm+4dm=10dm
8mm+10dm=8 mm+100mm=108mm
40cm+600mm=1m
6dm+40cm=6dm+4dm=10dm
3)un automibil a parcurs 900 km in 3 zile stiind ca in primele doua zile a parcus 600 km iar in ultimele doua zile 500 km afla kilometri a parcurs in fiecare zi.
a+b+c=900
a+b=600
b+c=500
c=900-(a+b)=900-600=300 km a parcursa in a 3-a zi
b=500-300=200 km a parcursa in a 2-a zi
a=600-200=400 km a parcursa in 1 zi
