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There are 100,000 cm in a km. Thus to convert from km to cm you have to multiply by 100,000. In this case we have 3km, so multiply that by 100,000 and you get:

3x100,000 = 300,000. Thus there are 300,000cm in 3km.

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13y ago
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Q: How much cm is in 3 km?
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