UNBELIEVABLE MATH PROBLEM

[KeithTalent]

Cool, I like that. Though I would probably say the same thing if someone was just jingling their keys in front of me.

 

[0]

Originally posted by: dullard


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

FTW

 

[lyssword]

Originally posted by: 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?

hehe lol QFT

 

[Demon-Xanth]

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) X
3. Multiply by 80 X*80
4. Add 1 X*80+1
5. Multiply by 250 20000*X+250
6. Add the last 4 digits of your phone number 20000*X+250+Y
7. Add the last 4 digits of your phone number again. 20000*X+250+2Y
8. Subtract 250 20000*X+2Y
9. Divide number by 2 10000*X+Y

Do you recognize the answer?

Math wins!

Yes, my phone number is indeed X-Y.

 

[Armitage]

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)
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?

xxx-yyyy

xxx*80
xxx*80 + 1
(xxx*80 + 1)*250
(xxx*80 + 1)*250 + yyyy
(xxx*80 + 1)*250 + yyyy + yyyy
(xxx*80 + 1)*250 + yyyy + yyyy - 250
((xxx*80 + 1)*250 + yyyy + yyyy - 250)/2
(xxx*80*250 + 250 + 2*yyyy - 250)/2
(xxx*80*250 + 2*yyyy)/2
(xxx*40*250 + yyyy)
xxx*10000 + yyyy
xxx0000 + yyyy
xxxyyyy

Amazing!

meh - get interupted in the middle of a post and dullard steals the show

 

[CPA]

Originally posted by: 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.

lol, I taught my oldest the concept of negative numbers at 4 years old. Got tired and never taught my other kids.

 

[ryan256]

Originally posted by: Armitage
xxx-yyyy

xxx*80
xxx*80 + 1
(xxx*80 + 1)*250
(xxx*80 + 1)*250 + yyyy
(xxx*80 + 1)*250 + yyyy + yyyy
(xxx*80 + 1)*250 + yyyy + yyyy - 250
((xxx*80 + 1)*250 + yyyy + yyyy - 250)/2
(xxx*80*250 + 250 + 2*yyyy - 250)/2
(xxx*80*250 + 2*yyyy)/2
(xxx*40*250 + yyyy)
xxx*10000 + yyyy
xxx0000 + yyyy
xxxyyyy

Amazing!

meh - get interupted in the middle of a post and dullard steals the show

lol... yeah I was about to post something similar as to why this works as well but saw someone else already did.

 

[40Hands]

Originally posted by: 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:

What is even better is he actually took the time to write that out to prove something everyone already knew.

 

[saymyname]

I thought I screwed up the math but I called the number anyways and scored a date. Thanks!

 

[zanieladie]

Originally posted by: saymyname
I thought I screwed up the math but I called the number anyways and scored a date. Thanks!

That's funny.

 

[Armitage]

Originally posted by: BroeBo

Originally posted by: 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:

What is even better is he actually took the time to write that out to prove something everyone already knew.

Alot of people don't know it - they think it's some kind of magic formula. I get this a few times a year from friends and family - looking down through the chain of forwards - or sometimes in the problem statement somebody gets excited about finding some "magic formula" that all phone number conform to :roll:

 

[thoro86]

Hahahaha, I think I've tried these before...

 

[zanieladie]

Originally posted by: Armitage

Alot of people don't know it - they think it's some kind of magic formula. I get this a few times a year from friends and family - looking down through the chain of forwards - or sometimes in the problem statement somebody gets excited about finding some "magic formula" that all phone number conform to :roll:

I didn't think it was a magic formula. I just think it's a neat thing to show people who don't understand the math behind it. It's great for kids!

 

[SlitheryDee]

I got a better one.

1. Go here.

2. Input your name and the state you live in.

3. IT GIVES YOU YOUR FREAKING PHONE NUMER AND ADDRESS OMGWTF!!!!

 

[zanieladie]

Originally posted by: SlitheryDee
I got a better one.

1. Go here.

2. Input your name and the state you live in.

3. IT GIVES YOU YOUR FREAKING PHONE NUMER AND ADDRESS OMGWTF!!!!

Not mine...it's unlisted.

 

[mezrah]

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

haha..you nailed it

 

[Umberger]

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

AMAZING! oh, wait.....

 

[EngenZerO]

OMG!!!!! HOW!!!!

 

[FrustratedUser]

I got Bill Gates phone number. What did I do wrong?

 

[Fenixgoon]

ZOG! haxx0rz!

 

[chuckywang]

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)
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?

Gee...let x be the first three digits, and y be the last four digits:
(250(80x+1)+2y-250)/2 =10000x+y, which is of course your phone number.

Geez, do you even know math?

 

[akubi]

feeling a little redundant today, are we?

 

[JackBurton]

Let me shorten it up for you...

1. Take your first 3 numbers of your phone number (not your area code) and multiply it by 10000
2. Now add your last four digits

Ooooooo, does something look familiar?

Jesus Christ this is retarded.

 

[desteffy]

you have got to be kidding

 

[Rudee]

Whop-de-friggen-do. Enter in all 7 digits of your phone number and the calculator gives you the number back. This is stupid.