Not very long.
Are asking about a conversion or an object that's 80mm long?
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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.
80 mm is 80 millimeters. milli means 10^-3 (or one thousandth). So, 80 mm is 0.08 meters
800 mm = 80 cm800 mm:= 800 mm * 1 cm/10 mm= 80 cm
80 mm
1 cm = 10 mm 80 cm = 80x10 = 800mm And 800 mm is 800 mm You decide