Challenges. Maths questions for KS3 and KS4.

This is a set of very useful challenging questions, which are to an extent open ended. There are many ways in which you could use these, they would work well as a 'maths challenge of the week' or something similar with a prize for the best answers. Or you could use them as starters to get students thinking, or you could use them in a carousel lesson with a different problem on each table. Thank you for sharing.