Interesting math problem

Category: Let's talk

Post 1 by BB (move over school!) on Saturday, 14-Apr-2007 9:24:46

Wasn't too sure where to post this one. Have fun.

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. Grab a calculator (you won't be able
to do this one in your head).



1. Key in the first three digits of your phone number (NOT the Area
Code)
2. Multiply by 80
3. Add 1
4. Multiply by 250
5. Add the last 4 digits of your phone number.
6. Add the last 4 digits of your phone number again.
7. Subtract 250
8. Divide number by 2

Do you recognize the answer?





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Post 2 by BB (move over school!) on Saturday, 14-Apr-2007 9:29:24

sorry for the shit at the bottom of this post, forgot when I copied and pasted it.

Post 3 by speedie (move over school!) on Saturday, 14-Apr-2007 11:09:19

I'm always happy to look at new cars and your maths problem ..I'll let you know.
Stevie.

Post 4 by purple penguin (Don't you hate it when someone answers their own questions? I do.) on Saturday, 14-Apr-2007 11:37:12

That is soo cool!

Post 5 by fuzzy101 (The master of fuzz!!) on Saturday, 14-Apr-2007 15:31:01

Now that's some creative thinking there.

Post 6 by margorp (I've got the gold prolific poster award, now is there a gold cup for me?) on Saturday, 14-Apr-2007 16:29:28

I got that in an email actually.

Post 7 by mysticrain (Art is born of the observation and investigation of nature.) on Saturday, 14-Apr-2007 21:50:56

That was freakin cool!

Post 8 by Blue Velvet (I've got the platinum golden silver bronze poster award.) on Saturday, 14-Apr-2007 23:11:10

Hmmm, the answer means nothing to me.

Post 9 by Reyami (I've broken five thousand! any more awards going?) on Monday, 16-Apr-2007 22:50:07

I screwed it up the first time I tried this, but that's pretty cool. I've seen something similar, but I can't remember how to do that one. Do you know where I can find similar math problems?

Post 10 by Thom3of5 (Do the Doo.) on Monday, 16-Apr-2007 23:24:38

1. Call your prefix x.
2. Multiply by 80 you get 80x.
3. Add one you get 80x+1.
4. multiply by 250 you get 20000x+250.
5. add the last four, you get 20000x+250+last 4.
6. Add the last 4 of the number again you get 20000x+250+2 times the last 4 numbers.
7. Subtract 250 you get 20000x+2 times the last 4 numbers.
8. Devide by 2 and you get 10000x+the last 4 numbers.
It comes out to the phone number, because 10000 times the prefix only moves it over to the left 4 spaces which allows you to insert the last 4 numbers of your phone number.

Post 11 by Reyami (I've broken five thousand! any more awards going?) on Monday, 16-Apr-2007 23:46:49

... um ... okay? I didn't exactly understand it, but I guess that makes sense.

Post 12 by blbobby (Ooo you're gona like this!) on Tuesday, 17-Apr-2007 4:32:44

Well said thom3of5.

It's one of those trick math problems that give you the same number after going through all sorts of meaningless girations.

Or, maybe it's magic, and if you work it out and send it to the square root of your phone number of friends you will receive a good feeling and the answer to a prayer.

I prefer to think it's a trick problem.

As I said, well done thom3of5.

Bob

Post 13 by retrieverdog (when I'm in seventh hour, my work does show.) on Saturday, 21-Apr-2007 16:03:02

totally awesome. there's also this thing that my math teacher gave us that it would give us our day of the week that we were born and it was really wierd. but I don't know where it is. if I find it I'll post it.