If you are using a cable-supplied converter box, you will probably not be seeing those fractional or decimal numbers, but a 1,2 or 3 digit number from 2 (1?) to 999. At least that’s the way Charter Communications does it.
One advantage of the converter box to the consumer is that the channel numbers will always be correct even if the actual frequency changes; translation is done invisibly.
Charter subscribers without converter boxes have awakened some mornings and found that the channel they want to watch appears to be gone. The smarter ones will re-scan their TV and if they are diligent enough to click on all 998 possibilities, find the missing channel someplace else, like 12-9. Calls to tech support will be futile, because neither the customers or the customers’ agents are ever notified of these changes before or after.
Charter’s brilliant solution is to rent you a box at $7 per month, per set. In my area, that is an option until April of this year, when your choice of going without will no longer be available and a box will be mandatory.
They do if you have a converter box.