The Binary Card Trick

Thanks to Don Krug for the following materials:

• Here is an explanation of the binary card trick.

• Here are the six cards we generally use (featuring the first 63 natural numbers). They can be printed as is, three cards to a page. Make bigger sets by using higher powers! That helps folks assure themselves that you, the magician, are not simply scanning the cards for the common number.

Links:

• A set and description for the first 31 naturals
• Another set, of seven cards
• Sheri and the magic number cards