5 of course
one tenth of a milimeter
Millimetres and millimetres are the same measurement. Therefore, 547 millimetres is equal to 547 millimetres.
A mm (millimetre) is one thousandth of a metre, i.e. 0.001 m. A Mm (megametre, a valid unit but very seldom used) is one million metre, i.e. 1,000,000 m (or 1,000 km). So, there are (1 Mm) / (1 mm) =...
25.4 mm in an inch