2,5 km=.....m=..........cm
1234mm=.........m=.........hm=.......km
250m=....dm=......mm
3,2m3=..........dm3=.........cm3=.......cc
4,5m3=.....l=......ml
123 l =.......cm3=.......cc=........m3
3kg=.......g ; 4562kg=.....tạ=.......tấn
m=235kg thi P=.........N ; m=560g thì P=.........N
P=240N THI m=KG ;P=28N thi m=.......kg
chú ý: 1dm3=1l ; 1cm3=1cc ; 1cm3=1ml=1cc