Odpowiedź:
3. 5 cm^2= 500mm^2
3 dm^2= 30 000mm^2
7 dm^2= 700cm^2
4300 mm^2= 43cm^2
20 000mm^2= 2dm^2
2300 cm^2= 23dm^2
31 cm^2= 3100mm^2
25 dm^2= 250 000mm^2
50 dm^2= 50 000cm^2
19 000 mm^2= 190cm^2
180 000 mm^2= 18 dm^2
111 000 cm^2= 1110dm^2
