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Author Topic: Cool Math Question  (Read 5973 times)

The Gilly

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Cool Math Question
« on: January 24, 2005, 11:12:48 AM »
 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? 
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DragonSpeed

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Re: Cool Math Question
« Reply #1 on: January 24, 2005, 02:22:57 PM »
That is neat.  Also, if you abstract it, you can see why it works:

If you use a varialbe, x, for the first 3 digits and a variable, y, for the last four digits, you can write an expression and simplify it:

80x

80x+1

250(80x+1)

250(80x+1)+2y

250(80x+1)+2y-250

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

Factor 2 out of the numerator:
2[125(80x+1)+y-125]/2

Cancel out 2:
125(80x+1)+y-125

Distribute:
10000x+125+y-125

Simplify:
10000x+y

When you multiply the first 3 digits by 10000 you will have xxx0000 and then you add the last four digits to end up with xxxyyyy, your telephone number! Therefore it should work no matter what the phone number.
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the_pict

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Re: Cool Math Question
« Reply #2 on: January 24, 2005, 04:43:42 PM »
 ;D ;D ;D   and thanks ds for the high school maths class  flash backs arghhhh  lol  ;)
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DragonSpeed

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Re: Cool Math Question
« Reply #3 on: January 24, 2005, 06:37:28 PM »
LOL - math is fun!  :o
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chris gadsden

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Re: Cool Math Question
« Reply #4 on: January 24, 2005, 06:44:25 PM »
Quote from: DragonSpeed on January 24, 2005, 06:37:28 PM
LOL - math is fun!  :o
I hated math and still do except when you are measuring the lenght and the weight of a fish. Go Imperial not Metric, Imperial sounds a lot bigger. ;D ;D
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Sandy

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Re: Cool Math Question
« Reply #5 on: January 25, 2005, 06:06:24 PM »
you guys need to go fishing
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finding your limits is fun, it can also be VERY painful.

If you care about Canada's future, get involved by holding your MLA's & MP's accountable!! don't just be sheep!!

chris gadsden

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Re: Cool Math Question
« Reply #6 on: January 25, 2005, 11:15:13 PM »
Quote from: Sandy on January 25, 2005, 06:06:24 PM
you guys need to go fishing
Taking your advice and going tomorrow and will get that first hatchery as well. So much for the math. ;D
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The Gilly

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Re: Cool Math Question
« Reply #7 on: January 27, 2005, 08:40:49 AM »
New math question.  If you co fishing 0 times for Steelhead, how many will you catch?  :'(  :'(  :'(  :'(  :'(
Somebody call my wife and plead my case
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Buck_wife

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Re: Cool Math Question
« Reply #8 on: January 27, 2005, 01:45:30 PM »
Well, being the wife of a fisherman (and mother of 4 kids), I have to admit I do sympathize with your wife  ;)
but I always tell myself, there are much worse things a husband could be doing besides fishing. Maybe just run that by her   
Don't know if that will help your case at all  ;D

Cool math question btw, (just so it doesnt look like I am high-jacking the thread  :))
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