xkcd’s Password Strength cartoon might be a fun prompt for a maths lesson.
Children at primary school seem to like cracking codes, and hackers have a certain murky glamour to them. Better yet, password, security and spying is a rich topic. My Year 5’s have loved some basic frequency analysis. It ties in with the Tudors and the Babington Plot which ties in with Religious Studies which ties in with PSHE etc etc.
Now need to do a quick bit of research to see what else indices & password cracking to tie in to and make it a richer topic than just a cartoon. Any suggestions welcome.