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Anonymous
A km is 1000 meters. There are 100 cm per meter. So multiply by 105.
That gives you 121 X 105 cm.
Change it to the more commonly used 1.21 X 107 cm.
Or 12,100,000
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244 cm
1 mm = .1 cm
There are 100 cm (centimeter) in one m (meter).
125mm
20mm