Over the years, several Pre-K and Kinder teachers have asked me how I got my kiddos to cut so well. Granted that the majority of the time when it's required, it's usually to cut out squares to glue onto boxes. But I believe children need more dexterity than that.
So I use these simple templates. I've included a sample below. (You can click on the photo for the full size and copy to save on your computer.)
Normally, I draw several different kinds of lines per sheet of scratch paper. I've also drawn loops. These practice sheets are perfect for when a student has finished his work early, and needs something to occupy his time before going on to the next lesson.