I finally figured it out. Took me about 15 minutes. My Math for Poets teacher in college would be so proud! He always was trotting out stuff like this.
I had to hop on it as soon as I heard about it on the podcast (in fact as i'm writing this i'm still listening to the episode), as soon as I saw the chart and how the symbols repeated I had my idea of how I thought it worked, just to be sure I ran the equation the page gives you for numbers 11 through 29 and it confirmed that this works in the way I suspected. if anyone is looking for the link to the trick here it is: http://www.mikesuper.com/interact/online/magic.htm
I'm going to be teaching multiples to my 3rd graders next week as we begin multiplication. It'll be fun to see if they can figure this out for homework.
I feel like an idiot, it took me 5 go's before I figured it out. And the sad part is I have been fooled by something like this before. I guess I really don't learn from past mistakes. Well at least I know how he does it now
Look at the multiples of 9 in the chart - they all have the same symbol. Doing those mathematical calculations, your answer will always be a multiple of 9.
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