Math Problem - Crazy!

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    SensGirl11
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    Math Problem - Crazy!

    Post by SensGirl11 on Thu Apr 30, 2009 3:17 pm

    Do it!

    Here is a math trick so unbelievable that it will stump you.

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

    1. Key in the first 3 digits of your phone number (Not the area code)
    2. Multiply by 80
    3. Add 1
    4. Multiply by 250
    5. Add this to the last 4 digits of your phone number
    6. Add to this the last 4 digits of your phone number again
    7. Subtract 250
    8. Divide the number by 2
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    shabbs
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    Re: Math Problem - Crazy!

    Post by shabbs on Thu Apr 30, 2009 3:22 pm

    Neat.

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    Re: Math Problem - Crazy!

    Post by Guest on Thu Apr 30, 2009 3:25 pm

    So i imagine that you get your phone number as the final answer?
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    Cap'n Clutch
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    Re: Math Problem - Crazy!

    Post by Cap'n Clutch on Thu Apr 30, 2009 3:25 pm

    That weirds me out. I'm going to have to tell my Wife that one to see if she can determine the key to this quandry (sp).

    For now - Math Problem squirrel


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    Re: Math Problem - Crazy!

    Post by caissie_1 on Thu Apr 30, 2009 3:27 pm

    Not bad!
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    Re: Math Problem - Crazy!

    Post by shabbs on Thu Apr 30, 2009 3:29 pm

    Cap'n Clutch wrote:That weirds me out. I'm going to have to tell my Wife that one to see if she can determine the key to this quandry (sp).

    For now - Math Problem squirrel
    The key is steps 2 and on. They are geared to ensure you end up back with the 4 digit number you give it. You can do this with any starting number.
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    Re: Math Problem - Crazy!

    Post by SensGirl11 on Thu Apr 30, 2009 3:33 pm

    shabbs wrote:
    Cap'n Clutch wrote:That weirds me out. I'm going to have to tell my Wife that one to see if she can determine the key to this quandry (sp).

    For now - Math Problem squirrel
    The key is steps 2 and on. They are geared to ensure you end up back with the 4 digit number you give it. You can do this with any starting number.

    That's what I figured too. It's still cool though. cool)
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    Re: Math Problem - Crazy!

    Post by PTFlea on Thu Apr 30, 2009 3:34 pm

    Very queer (and by queer, I mean odd...not that there's anything wrong with that).
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    Re: Math Problem - Crazy!

    Post by Cap'n Clutch on Thu Apr 30, 2009 3:48 pm

    shabbs wrote:
    Cap'n Clutch wrote:That weirds me out. I'm going to have to tell my Wife that one to see if she can determine the key to this quandry (sp).

    For now - Math Problem squirrel
    The key is steps 2 and on. They are geared to ensure you end up back with the 4 digit number you give it. You can do this with any starting number.

    You give it a 3 digit number and then a 4 digit number and end up with a 7 digit number.


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    Re: Math Problem - Crazy!

    Post by shabbs on Thu Apr 30, 2009 4:10 pm

    Cap'n Clutch wrote:
    shabbs wrote:
    Cap'n Clutch wrote:That weirds me out. I'm going to have to tell my Wife that one to see if she can determine the key to this quandry (sp).

    For now - Math Problem squirrel
    The key is steps 2 and on. They are geared to ensure you end up back with the 4 digit number you give it. You can do this with any starting number.

    You give it a 3 digit number and then a 4 digit number and end up with a 7 digit number.
    You can start with any number (1,2,4,5,6 digits etc...) you'll end up with those 4 digits appended to the number you started with.
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    Re: Math Problem - Crazy!

    Post by wprager on Thu Apr 30, 2009 8:33 pm

    7 digit number is abcdefg =

    10000000*a+100000*b+10000*c+1000*d+100*e+10*f+g

    1. Key in the first 3 digits of your phone number (Not the area code)
    a*100 + b*10 + c

    2. Multiply by 80
    8000*a+800*b+80*c

    3. Add 1
    8000*a+800*b+80*c + 1

    4. Multiply by 250
    2000000*a+200000*b+20000*c + 250

    5. Add this to the last 4 digits of your phone number
    2000000*a+200000*b+20000*c + 250 + 1000*d + 100*e + 10*f +g

    6. Add to this the last 4 digits of your phone number again
    2000000*a+200000*b+20000*c + 250 + 2000*d + 200*e + 20*f +2*g

    7. Subtract 250
    2000000*a+200000*b+20000*c + 2000*d + 200*e + 20*f +2*g


    QED

    8. Divide the number by 2
    1000000*a+100000*b+10000*c + 1000*d + 100*e + 10*f + g
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    Re: Math Problem - Crazy!

    Post by shabbs on Thu Apr 30, 2009 8:38 pm

    wprager wrote:7 digit number is abcdefg =

    10000000*a+100000*b+10000*c+1000*d+100*e+10*f+g

    1. Key in the first 3 digits of your phone number (Not the area code)
    a*100 + b*10 + c

    2. Multiply by 80
    8000*a+800*b+80*c

    3. Add 1
    8000*a+800*b+80*c + 1

    4. Multiply by 250
    2000000*a+200000*b+20000*c + 250

    5. Add this to the last 4 digits of your phone number
    2000000*a+200000*b+20000*c + 250 + 1000*d + 100*e + 10*f +g

    6. Add to this the last 4 digits of your phone number again
    2000000*a+200000*b+20000*c + 250 + 2000*d + 200*e + 20*f +2*g

    7. Subtract 250
    2000000*a+200000*b+20000*c + 2000*d + 200*e + 20*f +2*g


    QED

    8. Divide the number by 2
    1000000*a+100000*b+10000*c + 1000*d + 100*e + 10*f + g
    Very well illustrated.
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    Re: Math Problem - Crazy!

    Post by wprager on Thu Apr 30, 2009 9:28 pm

    shabbs wrote:
    wprager wrote:7 digit number is abcdefg =

    10000000*a+100000*b+10000*c+1000*d+100*e+10*f+g

    1. Key in the first 3 digits of your phone number (Not the area code)
    a*100 + b*10 + c

    2. Multiply by 80
    8000*a+800*b+80*c

    3. Add 1
    8000*a+800*b+80*c + 1

    4. Multiply by 250
    2000000*a+200000*b+20000*c + 250

    5. Add this to the last 4 digits of your phone number
    2000000*a+200000*b+20000*c + 250 + 1000*d + 100*e + 10*f +g

    6. Add to this the last 4 digits of your phone number again
    2000000*a+200000*b+20000*c + 250 + 2000*d + 200*e + 20*f +2*g

    7. Subtract 250
    2000000*a+200000*b+20000*c + 2000*d + 200*e + 20*f +2*g


    QED

    8. Divide the number by 2
    1000000*a+100000*b+10000*c + 1000*d + 100*e + 10*f + g
    Very well illustrated.

    Just simple arithmetic, really.

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