Exercitiul 3:
a) 8 cm=80 mm
80 mm<98 mm
b) 4 cm=40 mm
37 mm<40 mm
c) 30 cm=300 mm
35 mm<300mm.
Exercitiul 7:
a) 7 dam+50 m+3 km+21 hm=10 m+50 m+3000 m+2100 m=5160 m.
b) 35 m+40 dam+3 hm=0,35 hm+4 hm+3 hm=7,35 hm.
c) 10 m+7 hm+30 m=1 dam+70 dam+3 dam=74 dam.
d) 7 dam+50 m+90 hm=0,07 km+0,05 km+9 km=9,12 km.
