There are 20,000 mm in 20 meters
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1 m = 1000 mm = 1000/50 = 20 lots of 50 mm
0.02 metres = 20 millimetres
http://wiki.answers.com/What_is_60_millimeters_equal_to_in_metersShort answer = 500.Little bit longer answer:1 m = 1,000 cm, and1 cm = 10 mm, therefore1 m = 10,000 mm, hence10,000 / 20 = 500, so20 mm x 500 = 10,000 mm or 1 m.
1 m = 1,000 mm 800 m = 800,000 mm
10 m = 10000 mm