J.R. S. answered 09/19/17
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32 m x 1000 mm/m = 32000 mm
7 kg x 106 Gg/kg = 7x106 Gg if you mean gigagrams (usually abbreviated Gg)
70 mm x 106 nm/mm = 70x106 nm = 7x107 nm
4.9 L x 1000 ml/L = 4900 ml
Try the others.