Domino Magic

Imagine a box of dominos with numbers from 0 to 6. Pull out any one domino and make sure it doesn't a blank or 0 on it. Follow these steps and I'll tell you what domino you had.
  1. Multiply one of the numbers by 5.
  2. Add 7 to the product.
  3. Multiply that sum by 2.
  4. Add the other number on the domino to the product.
  5. Tell me your number, but not your domino.


The Plaid Cow said...

That's pretty cool. For a math trick.

The Math Ninja said...

indeed. its a pretty easy one.