First, I laminated the book covers for durability, and hot glued strong magnets to the inside of the book jacket (holding the two covers together). Then, I bought some wooden dowels and drilled a small hole in one end. Next, I used fishing line and tied it through the hole on the dowel and attached a super strong magnet (a 9+ strength magnet) to the other end. Lastly, we made a "pond" with the book jackets on the floor and started fishing!
When the students "catch" a book, they determine if it is fiction or non-fiction. If they get it right, they keep it. If they get it wrong, they throw it back. It was a super engaging way to practice this skill! I did it with both kindergarten and 1st grade classes.