4 puzzles studying impossibility and paradoxes.

Two-way tables.

1. Distribute one copy of pupil sheets to each pupil, or to each pair to encourage discussion. Make sure you print 1 sheet per page.

2. You may wish to play the introductory video which quickly explains a couple of points about mathematical proof, or you may wish to explain these yourself.

3. Pupils should be able to work through tasks, but I suggest having a copy of the teacher sheets available if pupils are in need of some guidance.