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1000
50 millemeters exactly.
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.
2.5 decimeters=250 millimeters
(1/100000000) cm