UNBELIEVABLE MATH PROBLEM

[zanieladie]

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?

 

[akubi]

i hope you're joking...

 

[pontifex]

-16.278

nope, not a frickin clue...

did it wrong

i get my phone number

 

[CPA]

OMG, NOOOEEESSSSSSSSSSSSSSS!!!!!!11111!!!!!!!!ONE

 

[gigapet]

interesting.

 

[zanieladie]

Originally posted by: pontifex
-16.278

nope, not a frickin clue...

Wow. It worked for mine...

 

[SlowSpyder]

So the math gives you your phone number after you give it the numbers of your phone number? Amazing.

 

[destrekor]

not recognizing my answer either. care to fill in a step you may have forgotten? cuz im clueless here.

 

[Kntx]

51979... How did it know how many hours I've spent playing WOW?!?!!?

 

[kogase]

No I don't recognize the answer...

 

[dullard]

Let x=phone number divided by 10000, truncated.
Let y=truncated part
Thus, phone number = x*10000 + y

x
x*80
x*80 + 1
x*20000 + 250
x*20000 + 250 + y
x*20000 + 250 + y*2
x*20000 + y*2
x*10000 + y

All you do is input your number, manipulate it a bit, and then undo what you manipulated. Big deal that you get the same thing back.

Try this: Choose a number. Add one. Subtract one. Surprize! You get your number back! Why can anyone be amused by 1st grade math?

 

[Juno]

hmm...my phone number...

 

[HN]

i've never seen a math problem that gave you the steps to the answer.

 

[destrekor]

okay i got the answer now, phew.. its just my lack of skills at pushing enter on my windows calc between each step, it wasn't doing it right.

 

[krunchykrome]

Awesome

 

[PinmasterJay]

Originally posted by: SlowSpyder
So the math gives you your phone number after you give it the numbers of your phone number? Amazing.

OMGWTFHOWAMAZING

It worked for mine, but I'm really getting sick of these number puzzles

 

[LeiZaK]

Originally posted by: SlowSpyder
So the math gives you your phone number after you give it the numbers of your phone number? Amazing.

 

[zanieladie]

Originally posted by: dullard
Let x=phone number divided by 10000, truncated.
Let y=truncated part
Thus, phone number = x*10000 + y

x
x*80
x*80 + 1
x*20000 + 250
x*20000 + 250 + y
x*20000 + 250 + y*2
x*20000 + y*2
x*10000 + y

All you do is input your number, manipulate it a bit, and then undo what you manipulated.
Big deal that you get the same thing back.

Try this: Choose a number. Add one. Subtract one. Surprize! You get your number back! Why can anyone be amused my 1st grade math?

Yeah...YOU know this...I know this...so what. It's still neat.

 

[CPA]

Originally posted by: dullard
Let x=phone number divided by 10000, truncated.
Let y=truncated part
Thus, phone number = x*10000 + y

x
x*80
x*80 + 1
x*20000 + 250
x*20000 + 250 + y
x*20000 + 250 + y*2
x*20000 + y*2
x*10000 + y

All you do is input your number, manipulate it a bit, and then undo what you manipulated. Big deal that you get the same thing back.

Try this: Choose a number. Add one. Subtract one. Surprize! You get your number back! Why can anyone be amused my 1st grade math?

okay brainiac, maybe because this isn't first grade math. More like 7th.

 

[ddviper]

Originally posted by: dullard
Let x=phone number divided by 10000, truncated.
Let y=truncated part
Thus, phone number = x*10000 + y

x
x*80
x*80 + 1
x*20000 + 250
x*20000 + 250 + y
x*20000 + 250 + y*2
x*20000 + y*2
x*10000 + y

All you do is input your number, manipulate it a bit, and then undo what you manipulated. Big deal that you get the same thing back.

Try this: Choose a number. Add one. Subtract one. Surprize! You get your number back! Why can anyone be amused my 1st grade math?

OP Ownage

:beer: and have another :beer:

 

[krunchykrome]

I am not really here. What is here. It's really just a there without a T.

 

[dullard]

Originally posted by: zanieladie
Yeah...YOU know this...I know this...so what. It's still neat.

Try this UNBELIEVABLE word problem:
1) Type your first name.
2) Add a bunch of letters to it.
3) Type your last name.
4) Delete the letters you added in step 2.
5) Do you recognize the answer?

That is neat?

 

[rezinn]

Try this one.

Start with your phone number.
Add 5.
Multiply by 1.
Subtract 5.
Do you recognize the new number?

 

[dullard]

Originally posted by: CPA
okay brainiac, maybe because this isn't first grade math. More like 7th.

Hey, I did all that in 1st grade. Of course, my dad taught me algebra then.

 

[yelo333]

Originally posted by: zanieladie

> 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)
I'm calling this variable "a".
> 3. Multiply by 80
80 * a
> 4. Add 1
80a + 1
> 5. Multiply by 250
250(80a+1)= 20000a + 250
> 6. Add the last 4 digits of your phone number
20000a + 250 + b
> 7. Add the last 4 digits of your phone number again.
20000a + 250 + 2b
> 8. Subtract 250
20000a + 2b
> 9. Divide number by 2
10000a + b
> Do you recognize the answer?
Yes. My first three digits shifted left 4 digits + my last 4 digits = my phone number.

Just thought I'd post something hopefully helpful to those who don't understand why it works... Simple algebra, folks.

Edit: Urgh... I spent too much time formatting my post. dullard beat me too it. Oh well.