Entertaining Science Experiments with Everyday Objects by Martin Gardner

Author:Martin Gardner
Language: eng
Format: epub
Publisher: Dover Publications, Inc.
Published: 2013-10-14T16:00:00+00:00

MAGIC MULTIPLICATION

Here’s an amusing number trick to show your friends.

First jot down on a sheet of paper the “magic number” 12,345,679. It’s an easy number to remember because it consists simply of all the digits (numbers from 1 through 9) in serial order with the 8 omitted.

Now ask a friend to tell you his favorite digit. Whatever number he chooses, multiply it in your head by 9 and write the result beneath the magic number. For example, if he tells you his favorite digit is 3, you put 27 below the magic number. Then ask him to multiply 12,345,679 by 27. The answer is sure to astound him, for it will consist entirely of 3’s—the very digit he selected!

The trick works just as well with any digit. Try it and see.

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