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There are 1000 metres in one kilometre. Therefore, three and a half kilometres is equal to 3.5 x 1000 = 3500 metres.
Half a kilometre is equal to 500 metres. This is because there are 1000 metres in one kilometre, so half of that would be 500 metres. Kilometres and metres are both units of length in the metric system, with kilometres being larger units and metres being smaller units.
Remember in 1 kilometre there are 1000 metres. So in 4 kilometres there are 4 x 1000 = 4000 m In half a kilometre (0.5) there are 1000/2 = 500 metres. So in 4.5 kilometres there are 4000 + 500 = 4500 metres.
1 kilometre = 1000 metres