With 10 decimeters to a meter, 4 meters is 40 decimeters, which is a lot less than 400 decimeters.
4m
greater
400 decimeters. 1 meter equals 10 decimeters.
400
less than
No, it is not.
4 km
400 millimeters=4 decimeters
4 dm is greater than 400mm
No, 4 meters is less than 450 centimeters because 4 meters equals 400 centimeters
4 meters is 40 dm (decimeters), yes More popular use is of 400 cm centimeters or 4000 mm (milimeters)