40
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They're the same amount because 10cm= 1dm and 10x4=40 and 1x4=4 and 4dm= 40cm
There are 10 centimetres in one decimetre. Therefore, 4 decimetres is equal to 4 x 10 = 40 centimetres. The two units are therefore the same.
Neither - they are the same measurement.
4dm=400cm that's what i think but I'm not so sure.
500mm is 25% bigger than 40cm.