How to divide an item value per 100

I´m using an Homatic binding and I get a humidity value in hundred degrees.
What is the best way to make a conversion (divided the item value by 100) ?
Thanks in advance

Using a JS transformation. Ideally the binding will let you set a transformation on the Channel. If not you can use a Transform profile.

Homematic humidity would I think usually want to be linked to a Number:Dimensionless type Item, and report in %.
What Item type do you have, what device is the source of the reading?