làm được cho 1 đúng
a 25m= ......dm b 60m=...............dam c 1mm=..............cm
500m=.............hm 1cm=............dm 1dm=.......m
13000m=.........km
125dm=...cm
200cm=.. ..mm
8 km 23m =....m 12m 4cm =..........cm 1045m=.............km.......m 678cm=............m..........cm