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50 millemeters exactly.
There are 25.4 millimeters in an inch, so 8 mm is a bit less than 1/3 of an inch.
1000
2.5 decimeters=250 millimeters
76.2 mm. There are 10 mm in a cm and 2.54 cm in an inch. Therefore 3 iches mulitplied by 2.54 is 7.62 cm and 7.62 cm multiplied by 10 is 76.2 mm.