Ví dụ :7800123m2=7km2 80hm2 01dam2 23m2 =7,800123km2
6km223456m2= .......km2.....hm2......dam2 .......m2=..........km2
5km2 246dam2=.........km2.........hm2.........dam2
57932cm2=................m2..............dm2.......cm2=..........m2
5,405m2=..............m2..................dm2.....cm2=............cm2=...........dm2