The
key to this magic trick is a bit of ALGEBRA.
Let's take a look at the steps one at a time
using Algebra.
Step 1:
Pick a whole number from one to 10.
(Here I don't know what you picked so I
call it "x".)
Step 2:
Double this number.
(Now I have two x's or 2x.)
Step 3:
Add 4 to this number.
(So now I have 2x + 4.)
Step 4:
Now divide by 2.
(Here the whole thing (2x + 4) gets divided
by 2.
Half of two x's is one x , and half of 4 is
2.
So now I'm left with x + 2.)
Step 5:
Finally, subtract your original number.
(I have x + 2, and I take away the original
x.
(x + 2  x = 2)
It really doesn't matter what you start with, because
I am subtracting it off right here. That will always
leave me with 2.)
Here is what the straight math looks like:
(2x + 4)  x =
........2
2x + 4  x
=
2......2
1x + 2  x =
(1x  x) + 2 =
0 + 2 = 2
now
you try!
Make your own mind
reading magic trick. The final answer
does not have to equal 2.
Be sure to include at least
5 steps.
Write out your
directions as you would say them
to an audience.
Then also write out an
ALGEBRAIC explanation of why it
works.
Good Luck! I can't wait
for you to READ MY MIND!
Copyright 19992005 themathlab.com

