- Cut a zigzag into a cardboard lid, as in the first photo.
- Cut out fish, all the same, and write positive and negative numbers on the tails to suit the level: +2, +1, 0, −1, −2. Size matters: the folded tail has to fit into the cuts in the lid.
- Make the eyes big so you can catch them.
- There are two levels: a hook on the end of a thread or, easier, on the end of a wire.
Now fish them out one by one, adding or subtracting the number on each tail!
We entered this craft in the Educació i les TIC contest.
