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Here's how I would do it. 1 mm = 10^-3 m, therefore 15.9mm= 15.9*10^-3m or (with better format) 1.59^10-2m. 1km = 10^3 m. Therefore 15.9mm = 1.59*10^-2 m/10^3 m/km = 1.59*10^-5 km.

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16y ago

What else can I help you with?