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There are 100,000 centimetres in one kilometre. Therefore, 42.15 centimetres is equal to 42.15 / 100,000 kilometres. Expressed as a decimal fraction, this is equal to 0.0004215 kilometres. Expressed as a vulgar fraction, this is equal to 4215/10000000. Cancelled down to a fraction in its lowest terms, this is equal to 843/2000000, or 843 two-millionths.

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15y ago

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