A decimeter is 1/10 of a meter, so 40 decimeters equals 4 meters.
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4 meters is equal to 40 decimeters
40 decimetres = 4 metres
You should use the relationship of 10 decimeters equal 1 meter. So if you have 4 meters could convert them into 40 decimeters.
40 meters equals 400 decimeters
4,000 millimeters=40 decimeters