Neat Little Trick

[skinamatic]

Try this and see what you come up with:

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

What do you have?

[Ancalagon the Black]

A completely random number.

Guess it doesn't work with eight-digit phone numbers. :)


EDIT: Ah, I can see that it'll come up with your phone number. Because it's equal to (if x is the first three digits of your number and y is the last four digits)

([250(80x+1)+2y]-250)/2

which reduces to

1000x + y

which should give you your very own phone number!

[skinamatic]

Use a 7 digit and see what you get.

[Ancalagon the Black]

I think I figured it out (see edited post). :D

[section 130]

Pretty darn nifty.

[Skeletor The Invincible]

Mr. Black was getting his order of operations mixed up.

Rather, his calculator was.

[J Dawg]

I got my full phone number

pretty cool stuff.

:dallasuck

[TXREDSKINS44]

That is pretty cool I got my phone number!

[rdsknbill]

Yep me too.

Skinmatic, you have WAY too much time on your hands. :laugh:

EDIT: How much time do I have that I actually did the trick. :doh: :laugh:

[SlobberKnockinFootball]

Dude, someone has too much time on their hands to be doing this :pooh:

[SKINtil8tin]

Originally posted by Ancalagon the Black

EDIT: Ah, I can see that it'll come up with your phone number. Because it's equal to (if x is the first three digits of your number and y is the last four digits)
([250(80x+1)+2y]-250)/2
which reduces to
1000x + y



Could've used you when I was flunking algebra in high school. :silly:

[Golgo-13]

Wild. Those math tricks go way over my head. I'm just a lowly social science major.

[Destino]

Originally posted by Ancalagon the Black
A completely random number.

Guess it doesn't work with eight-digit phone numbers. :)


EDIT: Ah, I can see that it'll come up with your phone number. Because it's equal to (if x is the first three digits of your number and y is the last four digits)

([250(80x+1)+2y]-250)/2

which reduces to

1000x + y

which should give you your very own phone number!

Hey egghead take a hike! :silly:

[artmonkfish]

how does this work? don't tell me you came up with that?!!

[Drex]

A neat trick indeed :)

[NASMTrainer]

Originally posted by Ancalagon the Black
A completely random number.

Guess it doesn't work with eight-digit phone numbers. :)


EDIT: Ah, I can see that it'll come up with your phone number. Because it's equal to (if x is the first three digits of your number and y is the last four digits)

([250(80x+1)+2y]-250)/2

which reduces to

1000x + y

which should give you your very own phone number!

I must have been doing time or been freeze dried, what is an eight digit phone number?

[Ancalagon the Black]

An eight-digit phone number is one that's in Australia. :)

And no, didn't get my order of operations screwed up. It doesn't work if your phone number has eight digits.

[mad4comp]

doesnt ([250(80x+1)+2y]-250)/2) reduce to:

(20000x+2y)/2:

10000x+y ?

[Ancalagon the Black]

You're right, mad4comp--I left out a zero. (So my answer didn't make sense anyway, given that y has four digits.) Good catch!