A Math Problem

Ya gotta try this! It’s cool! How is it someone gets this to work out this way?!
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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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Props to my email friend MAMBasket

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One thought on “A Math Problem

  1. This nearly drove me bonkers trying to figure out why it works. Finally, I gave up and googled it

    Explanation:
    Let x= 1st three digits of phone number
    let y= last 4 digits of phone number

    x
    80x
    80x + 1
    250(80x + 1) = 20000x + 250
    20000x + 250 + y
    20000x + 250 + 2y
    20000x + 2y
    10000x + y

    This last step shows why you get your phone number back.
    x (which represents your first three digits of your phone number) is multiplied by 10000, which just moves it over 4 places and then y is put in the four places on the right.

    Of course…now it’s perfectly clear. :[

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