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490cm to the nearest metre is 5 metres
The answer will depend on the units used for the quantity in the question. It should be obvious to anybody that 85.546875 kilometres to the nearest metre will be different from 85.546875 micrometres to the nearest metre!
The answer depends on the units used for 45.64. 45.64 micrmetres, to the nearest metre is 0 metres. 45.64 light second, to the nearest metre is 13,682,527,783 metres.
18700 metres, to the nearest metre, is 18700 metres!
8.4 metres to the nearest metre is 8 meters.