Math Games. Brain Teasers for Kids and Adults. AIMS Puzzle Corner: Free Math Puzzles. This week’s Puzzle Corner activity is a magic trick with a mathematical, as well as a slight-of-hand, component.
I first came across this trick in one of Martin Gardner’s many books on recreational mathematics. I liked it so much that I have been stumping students, friends, and family members with it ever since. In order to make this trick work, you will need to practice it by yourself until the moves (illustrated at bottom) become automatic, before trying it out on someone else. Riddles. Puzzles. Mensa For Kids. Logic Puzzles.