Similar outer shell
They came out in 1941 I found out this by looking on there website: http://www.m-ms.com/us/about/mmshistory/ They have loads of fun and games on there home page have fun!!
4.75 cm equals 47.5 mm. There are 10 mm in 1 cm. So you multiply 4.75 * 10.
one tenth of a milimeter
Millimetres and millimetres are the same measurement. Therefore, 547 millimetres is equal to 547 millimetres.