Le Pantin Monstre-Farceur
The mathematical word featured in this episode is: insert. Prankster Monster has received a crate containing a Prankster Juggernaut, but he can't open it. He asks for help from the math monsters to help him find a solution. A second box contains three triangles of different sizes. And, surprise, they see a triangle cut out on the side of the box which contains the puppet. They finally discover that by inserting the right triangle in the wall of the body, it will open. Like a key in a lock.
