3 ms·In the metric system, 1 mm = 0.001 m = 0.001 metres but 1 MM = 1000000 M = 1000000 ?????by troymc 15y agoIn the metric system, 1 mm = 0.001 m = 0.001 metres but 1 MM = 1000000 M = 1000000 ?????