21.2 x 100 = 2120.
2120mm is 2.12 metres.
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4700 mm
212 x 100/80 = 2120/8 = 265%
A meter is 100 cm and 1 cm is 10 mm Therefore 564 m and 3 mm = (564 x 100 x 10) + 3 = 564003 mm
(7.5 m) x (100 cm/m) x (10 mm/cm) = (7.5 x 100 x 10) = 7,500 mm
10 mm = 1 cm 100 cm = 1 m 1000 m = 1 km So 1 x 1000 x 100 x 10 = 1000000 mm.