5 dam2 = ………m2, 50000 dam2 = …km2, 55000000m2=….km2

5 dam2 = ………m2

50000 dam2 = …km2

55000000m2=….km2

90000 m2 = …..hm2

4m26dm2=…….m2

7km2 = …………..m2

2/5 phút = ……giây