A cool math trick
Here is a math trick so unbelievable that it will stump you. Personally I would like to know who came up with this and why that person is not running the country.
1.GRAB A CALCULATOR. (YOU WON'T BE ABLE TO DO THIS ONE IN YOUR HEAD)
2.KEY IN THE FIRST THREE DIGITS OF YOUR PHONE NUMBER (NOT THE AREA CODE)
3.MULTIPLY BY 80
4.ADD 1
5.MULTIPLY BY 250
6.ADD THE LAST 4 DIGITS OF YOUR PHONE NUMBER
7.ADD THE LAST 4 DIGITS OF YOUR PHONE NUMBER AGAIN.
8.SUBTRACT 250
9.DIVIDE NUMBER BY 2
DO YOU RECOGNIZE THE ANSWER?
posted by John Good @ 7:28 PM
6 Comments:
Wow! This is really neat! Obviously there is a math trick to this, but I don't see it!!!
These things rarely impress me. It's pretty simple. Starting at Step 2:
2) X, where X is a number comprised of the prefix.
3) 80x
4) 80x+1
5) 250(80x+1)
6) 250(80x+1) + Y, where y is a four-digit number.
7) 250(80x+1) + 2y
8) 250(80x+1) + 2y - 250
9) [250(80x+1) + 2y - 250]/2
Simplifying, we get
10,000x + y
Which means you are multiplying the prefix until the digits are in front of a seven-digit number then adding the last four digits. Pretty believable.
And yes, I'm a complete nerd.
Nerd Alert!
:)
Hey if it wasn't for nerds, we would not be communicating like this.
Now John, how did you get my phone#
Peace.
I think it's pretty neat when the light switch makes a light come on...
fairplaybeach and I would get along well. :)
I'm glad it was enjoyed by all. =) I try to not keep it all politics, all the time around here. . .
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