420 decimeters equals 42,000 milimeters.
Convert 420 decimeters into meters, kilometers, centimeters, micrometers, nanometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...
Convert 42000 milimeters into meters, kilometers, centimeters, micrometers, nanometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...