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Grab a calculator Put in the first three digits of your phone number, not the ... Stackers' Lounge forum

  1. #1
    cp6169's Avatar
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    Phone Number Magic Trick!

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    1. Grab a calculator
    2. Put 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 by 2

  2. #2
    naviwilliams's Avatar
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    Re: Phone Number Magic Trick!

    I can't beleive it, but it bloody works...! Brilliant

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    Re: Phone Number Magic Trick!

    Cool!

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    Re: Phone Number Magic Trick!

    Thats wild.

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    Re: Phone Number Magic Trick!

    Very Cool Chris!

  6. #6
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    Re: Phone Number Magic Trick!

    It's not that cool if you follow the maths but I'm just a spoilsport (and a maths teacher) :-)

    The pattern above breaks down to:
    take the first three numbers, 123
    multiply by 10000, 1230000
    Add the last four numbers, 1234567

    If x is the first three digits and y the last 4:

    3. 80x
    4. 80x+1
    5. 250(80x+1) = 20000x+250
    6. 20000x + 250 + y
    7. 20000x + 250 + 2y
    8. 20000x + 250 - 250 + 2y = 20000x + 2y
    9. 10000x + y

  7. #7
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    Re: Phone Number Magic Trick!

    OOOHHH its to early in NY. To comprehend that equation. LOL.

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    Re: Phone Number Magic Trick!

    Piano, being a math teacher, can you come up with a really hard one that will take us forever to figure out?

  9. #9
    StaceyRVC's Avatar
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    Re: Phone Number Magic Trick!

    LOL

  10. #10
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    Re: Phone Number Magic Trick!

    It's a part-time job. I teach maths to adult learners on Wednesday evenings and Saturday afternoons to help pay the rent. I don't set my students impossible problems - that won't really teach them anything!

  11. #11
    geoffm's Avatar
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    Re: Phone Number Magic Trick!

    nice...

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    Re: Phone Number Magic Trick!

    WHOAAAA......Where in the WWF did you find out that trick

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  14. #14
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    Re: Phone Number Magic Trick!

    For me, anything that gets people interested in Maths is cool :-)

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    Re: Phone Number Magic Trick!

    That's a great trick but math isn't my friend

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