The Astonishing Domino Math Trick

A simple trick involving some basic maths skills and a standard Western Double-Six set of dominoes..

Ask a volunteer to pick a domino from a facedown boneyard of tiles without showing you what it is.  Then ask them to perform the following calculations, with you then magically telling them the tile they hold.

• Take the number on one side of the tile and multiply by 5.
• Now add 7.
• Multiply by 2.
• Add the number on the other side of the tile.
• Announce the resulting value.

Now all you do is subtract 14 from the result and you have a two digit value with each digit representing a suit on the chosen domino.

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