This mathematical trick uses the metaphor of playing the piano to colourful effect and can be performed using any ordinary deck of playing cards
Method: The magician invites a volunteer to sit at a his table and to place his hands as if playing the piano.He then places two cards between the third and little finger of the volunteers left hand saying: ‘Here’s one pair’. Then another two cards between the third and second fingers saying:’Here’s another pair’. Next the magician puts two cards between the first and second fingers saying: ‘And here’s another pair’ Lastly, he places two cards between the volunteers forefinger and thumb saying: ‘And yet another pair here as well’.
The magician does the same with the volunteers right hand except this time he puts only one card between the thumb and forefinger stressing: ‘but this one is an odd card’.