What does m stand for in mathematical units,

What does m stand for in mathematical units,


rice



What unit does the letter mm in mathematics represent?
The unit of some math problems is (mm). I forgot what it means!


Mm (mm)
Cm (CM)
Decimeter (DM)
Meter (m)



3cm=( )m
3 cubic decimeter = () liter
2500 square decimeters = () square meters
5 m = 9) cm
1.2 tons = () tons () kg


3cm=(0.03 )m