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Math Help - I can't Subtract!

  1. #1
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    I can't Subtract!

    Yeah I'm serious I can't actually subtract lol...

    I always use the column method.

    Now if I get a problem like this

    1856 -
    3967

    OK I got answer 3889 but calculator got -2111

    this is how I do it.

    I first check and make sure that the top numbers are bigger than the bottom if now start borrowing, then subtract. However I always get the wrong answer

    How shall I do this?
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  2. #2
    MHF Contributor
    skeeter's Avatar
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    Re: I can't Subtract!

    1856 - 3967 = -(3967 - 1856)

    do the subtraction inside the ( ) , then change the sign
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  3. #3
    Member anonimnystefy's Avatar
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    Re: I can't Subtract!

    hi Mathsworld

    try to do it like this:

    1856-3967=-(3967-1856)

    now subtract normally and just add a minus sign in front.
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  4. #4
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    Re: I can't Subtract!

    oh ok , so you just put the bigger number on top and subtract then add the minus sign..
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  5. #5
    Member anonimnystefy's Avatar
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    Re: I can't Subtract!

    that's right.
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