There are 1000 x 10 = 10000 decimetres in one kilometre. Therefore, 400 decimetres is equal to 400/10000 = 0.04 kilometres.
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4 hectometres = 4*100 metres = 400 metres = 400*10 decimetres = 4000 decimetres.
There are 100 decimetres in one decametre.
.4 km
There are 10 decimetres in one metre. Therefore, 500 decimetres is equal to 500/10 = 50 metres.
There are 10 decimetres in one metre. Therefore, 24.3 decimetres is equal to 24.3/10 = 2.43 metres.