[Chevyboy]

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?

 

[Tom Hendricks]

Nope, must be doing something wrong.

 

[BillsCamino]

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?

Wow!
It gave me your Visa credit card number! Amazing. :thumbsup:

 

[NOZ34ME]

Things like this drive me crazy.

Obviously you're doubling the last 4 digits, then dividing by 2, so I can undersand how that works out- - -need to give some thought to the rest of the formula.

There goes my day- -

 

[Andy69]

A math buddy explained this kind of stuff to me once. The answer you arrive at is completely dependent on the numbers you input i.e. the digits from your phone number. All the other numbers do is "line up" the digits from your phone number in the right order. Still interesting. You gotta wonder who stays up nights thinking this stuff up and is math really that interesting?

 

[cobra2411]

Kinda like that mind reader that was posted here a while back. It was based off 9. Man that thing had me going for a couple hours... Guess it shows I'm not a math major...

David

 

[1badss396]

worked for me.:clonk:

 

[1966_L78]

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?

Easy, if you break it apart... 80 X 250= 20,000, 20,000/2=10,000...

10,000 X your prefix just adds 4 zeros after the number...

adding the 1, then times 250 = 250, and later subtract 250, net = zero...

adding the last 4 digits tice and then divide by 2 later, gives the last 4 digits...

since the prefix is followed by four zeros, and you now add the last 4 digits of your phone number, waalaa... you have your phone number...

took me 45 seconds to figure it out (and I never saw this one before, but thats the way I think). I do also wonder who stays up at night thinking these up...


As for that person running the country, would you really want someone that pulls a few smoke-n-mirror tricks to mask the obvious, to turn things around to make people "think" he was doing something special, to be the person running our country? (this was a little joke, BTW)

 

[69boo307]

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?

It's simple, really. Say your phone number is XXX-YYYY. Then do some grade school algebra.

((XXX80)+1)250+YYYY+YYYY-250)/2
=
(20000XXX+250+2YYYY-250)/2
=
20000XXX+2YYYY/2
=
10000XXX+YYYY
=
XXX,YYYY

yay!

*edit*Oops, someone beat me to it!*

 

[1968]

Doesn't work for me.