Sometimes (especially for children), it's easy to use more toilet paper than you really need. Although I don't have kids, I've found I use a lot less toilet paper by keeping a bean bag (or something similar) laying on top of the toilet roll. The bean bag just needs to be lifted slightly when you pull off the sheets you need and it makes me conscious of what I'm doing!
I have found that putting the roll on backwards is also a savings, especially if a child has fun unrolling it. If it is on the right way, all the TP would end up on the floor. If it is on backwards, the child may keep rolling the roll, but it doesn't come unrolled. Squishing the roll so it doesn't turn as smoothly also helps.
This page contains the following solutions.
When putting on a new roll of toilet paper, squeeze it first before you hang it. That way, it will not keep on rolling. Very helpful if you have small children.
Toilet paper can get used too quickly sometimes. Trying flattening the roll a bit to help prevent too much from easily unrolling.
