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#3 Domino Magic II
MaterialsYou 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!
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A set of dominoes |
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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:
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1. Enter one of the domino's numbers.(Blank 0) 3 |
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2. Multiply that number by 5. 3x5= 15 |
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3. Add 7 to that answer. 15+7=22 |
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4. Double that total. 22 x 2=44 |
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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
(If your friend had entered the 6 first, your final total would have been 63.)
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@geocities.com