Metric (SI) prefixes. (a) 20 Mg = _______________ g (b ) 16.2 m = _______ _______ _ m (c ) 0. Posted on November 15, 2020 | by wp 1. Metric (SI) prefixes. (a) 20 Mg = _______________ g (b ) 16.2 m = _______ _______ _ m (c ) 0.704 ms = ____