How to remove the last digit?

[BK]

For example
125000 -> 125
55000 -> 55
34500000 -> 34500
182309000 -> 182309

I wanna get the above results
If the last 3 digits at the end are not 000, or if the value is 0
I want to ignore it.

I using commends a trim, left, right, remove, etc..
but I don't know

I want to know how to do it.