Magic Tricks
Here is the teacher notes here for the easier multiples of 9 trick. The teacher notes for the easier trick go into more detail divisibility, and the discussions that could be had in the classroom.
We have also made teacher notes for the product of digits trick (divisibilty tests, probability) – the more difficult multiples of 9 trick. Most of this is high level probability for GCSE or A-Level students, but I’ve put it here for your interest.
Here is the teacher notes for the three digit number trick.
Here is the cheat sheet for the 27 card trick.
Fold and Cut Theorem
We have made Christmas themed (www.think-maths.co.uk/festive-fold-cut and Halloween themed (www.think-maths.co.uk/fold-and-cut-bat) fold and cut resources over the years.
Erik Demaines website (mathematician who worked on fold and cut): https://erikdemaine.org/foldcut/
A video about the fold and cut theorem:
Mobius Loops
Here is the mobius loops investigation sheet
Bar Code Trick
Worksheets about the barcode trick: www.think-maths.co.uk/bar-code-trick
Linking Puzzle from Problem Solving session
Please also find here the images for the joining up identical symbols puzzle.