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#3 Domino Magic II

You ask your friend to choose any domino when your back is turned. When the magic words "Hocus Pocus" are entered in a calculator the number of dots on each part of the domino suddenly appear!

Materials

 A set of dominoes A calculator

Presentation

You spread a set of dominoes out on a table, and then ask your friend to secretly choose one.

Example

Hand him the calculator and tell him to:

 1. Enter one of the domino's numbers.(Blank 0)        3 2. Multiply that number by 5.                                 3x5= 15 3. Add 7 to that answer.                                         15+7=22 4. Double that total.                                                  22 x 2=44 5. Add the domino's other number to that result. 44+6=50

Finally, tell your friend to hand you the calculator with his answer. Enter the magic words "Hocus Pocus" by pushing  -(minus) 1... 4... =

As you push the buttons, say "Ho-Cus-Po-Cus," and the number of dots on both parts of the domino will magically appear!

50-14=36

Exceptions

When your friend chooses a domino with one blank and enters the 0 first, your final total has only one digit.

Example: The final total is 5.

5=O 5 so the domino has a blank and a 5.

When your friend chooses a domino with two blanks, your final total will be 0 because 0 = 00.

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Page by: Mathman (Bruce A. Titen) ©1998

Questions or Comments email me at: HBWmathman@oocities.com