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Four-tenths of a metre.
There are 10 mm in a cm, so 8 cm in equivalent to 80 mm. 80 mm / 2 mm = 40. Therefore, 8 cm is 40 times as long as 2 mm.
90
400 decimeters 4,000 cm 40,000 mm
20 mm / 40 cm = 2 cm / 40 cm = 2/40 = 1/20 or 0.05