To convert from dekameters to decimeters, you can use the metric table.
1 dekameter (dm) = 10 decimeters (dm).
Therefore, to convert 3.5 dekameters to decimeters:
3.5 dekameters * 10 (decimeters per dekameter) = 35 decimeters.
So, there are 35 decimeters in 3.5 dekameters.