Playing card mathematics
A collection of classroom based teaching ideas using playing cards
NRICH playing cards
Playing card ideas from NRICH
Transum playing cards
"Imagine you are on a desert island with nothing but a pack of playing cards. Do you have to stop learning mathematics? Of course not, there are many fascinating mathematical activities you can enjoy and here are some ideas."
21-card trick - Numberphile
Wow your friends! (Maybe!)