11.22.2005

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.

2 comments:

The Plaid Cow said...

That's pretty cool. For a math trick.

The Math Ninja said...

indeed. its a pretty easy one.