10. This is very clear on any standard ruler
centermetre
There are 100 square millimetres in 1 square centimetre.
centermetre stick
2 centermetre
There is 0.1 cm in one mm.
25.4 mm in one inch.
100 mm
One inch is exactly 25.4 mm.
There are 1,000 mm in one meter.
one tenth of a milimeter
One inch is about 25.4 mm
14.3 mm. There are 10 mm in one cm.