Archive for the ‘Math Magic’ Category

Math Magic: Mind-Reading Web Sites

November 23, 2007

crystal.jpgThere are several sites online that claim to read your mind. A typical scenario is as follows:

You pick a two-digit number, add the digits, and subtract that sum from your original number. You then look up this difference in a chart of numbers [from 0 to 99] and make note of the associated symbol. The site will then tell you what symbol you noted.

You can play this game for yourself at (for example) or The Ghost Whisperer’s Crystal Ball on CBS’s website.

Magic on the Internet? A mathematical trick? See if you can figure it out (or post a comment if you need a hint!).