It's as difficult to figure out as Chinese arithmetic

Half Dollar to 5 Dimes

The spectator now turns the envelope around & on the other side is the number which corresponds to the number of spots on the top of the rolled die

there are other ideas which are basically self working

' Although it's a completely fair choice

Linking Rings (World's Greatest Magic) - (Download) Barry It's as difficult to figureIn this volume, you'll discover the Linking Rings, one of magic's most enduring classics. For centuries, magicians have charmed, baffled and amused their audiences with the mysterious linking and unlinking of solid metal rings and on this video, you'll see some of the most magical routines ever created for this ancient trick from six modern masters, each with their own take on the Rings. Watch and learn Jeff McBride's amazing 6 ring stage routine,