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Math Help - Struggling with maths need a little help

  1. #1
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    Unhappy Struggling with maths need a little help

    I am strugling with some basic maths and I wonderd if someone would explain this to me, I think I am looking at it all wrong.

    4-(-3)=7 correct?

    Well I dont understand this.

    If I had 4 marbles and used the (-3) on them I would be left with 1 marble right?

    Sorry guys if this seems realy dumb but I find it realy hard to get my brain around maths

    $ilver
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  2. #2
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    Quote Originally Posted by $ilver View Post
    I am strugling with some basic maths and I wonderd if someone would explain this to me, I think I am looking at it all wrong.

    4-(-3)=7 correct?
    Yes, this is correct. Mathematically, we can apply this.

    Quote Originally Posted by $ilver View Post
    Well I dont understand this.

    If I had 4 marbles and used the (-3) on them I would be left with 1 marble right?

    Sorry guys if this seems realy dumb but I find it realy hard to get my brain around maths

    $ilver
    For the marble question, you cannot have -3 marbles so that question (I believe) is asking what whould happen if there were 4 marbles and you take 3 away.

    4\text{ marbles} + (-3\text{ marbles}) = 1\text{ marbles}

    For objects, you cannot have a number less than 0 so when given, you assume that they are saying, what happens when this quantity is subtracted.
    Last edited by Simplicity; September 2nd 2008 at 03:30 AM. Reason: Appearance
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  3. #3
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    For the marble question, you cannot have -3 marbles so that question (I believe) is asking what whould happen if there were 4 marbles and you take 3 away.

    4\text{ marbles} + (-3\text{ marbles}) = 1\text{ marbles}

    For objects, you cannot have a number less than 0 so when given, you assume that they are saying, what happens when this quantity is subtracted.
    So basicaly then I am thinking of numbers as objects? Like when I count on my fingers each finger is an object of the number it represents?

    Why isnt 4-(-3)=7 written 4+3=7 ? and what happens to the - in (-3)? it isnt reflected in the answer that I can see.

    OMG im realy confused now!!
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  4. #4
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    Quote Originally Posted by $ilver View Post
    So basicaly then I am thinking of numbers as objects? Like when I count on my fingers each finger is an object of the number it represents?

    Why isnt 4-(-3)=7 written 4+3=7 ? and what happens to the - in (-3)? it isnt reflected in the answer that I can see.

    OMG im realy confused now!!
    4 - (-3) = 4 + 3 = 7

    When you have two signs together, like above then there is a change of sign.

    x- (-y) = x + y
    x + (-y) = x - y
    x - (+y) = x-y
    x + (+y) = x + y

    Like signs make positive and different signs make negative.
    Last edited by Simplicity; September 2nd 2008 at 03:35 AM. Reason: Spelling mistakes.
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  5. #5
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    Quote Originally Posted by $ilver View Post
    So basicaly then I am thinking of numbers as objects? Like when I count on my fingers each finger is an object of the number it represents?

    Why isnt 4-(-3)=7 written 4+3=7 ? and what happens to the - in (-3)? it isnt reflected in the answer that I can see.

    OMG im realy confused now!!
    I can't think of numbers as objects. They're just numbers, I guess.

    Whenever you multiply a negative number by a negative number, the answer is positive. This is essentially what you are doing here. You are multiplying the number -3 by -1. Although the 1 isn't written, it is assumed. So yes, it could be written as 4 + 3 = 7. It's the same thing. But then that would be too easy. LOL
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  6. #6
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    Ok gotcha! I didnt understand how the signs worked, that helps a lot guys.

    Thanks

    PS would you beleive im 39?!! I wanted to do a science course on open university but I have discoverd my maths is SO BAD in need to learn it before I even start the course!!
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  7. #7
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    Quote Originally Posted by Air View Post
    4 - (-3) = 4 + 3 = 7

    When you have two signs together, like above then there is a change of sign.

    x- (-y) = x + y
    x + (-y) = x - y
    x - (+y) = x-y
    x + (+y) = x + y

    Like signs make positive and different signs make negative.
    Ummm where do the multiply signs fit into all this?
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  8. #8
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    Quote Originally Posted by $ilver View Post
    Ummm where do the multiply signs fit into all this?
    I'm not sure what you mean by multiplication sign.

    The rules that I have given are arithmetic addition and subtraction rule.

    Have a read on this websites, it explains rules of addition, subtraction, multiplication and division: Link (Arithmetic Rules)
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  9. #9
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    Just what I needed
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  10. #10
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    Quote Originally Posted by $ilver View Post
    I am strugling with some basic maths and I wonderd if someone would explain this to me, I think I am looking at it all wrong.

    4-(-3)=7 correct?

    Well I dont understand this.

    If I had 4 marbles and used the (-3) on them I would be left with 1 marble right?

    Sorry guys if this seems realy dumb but I find it realy hard to get my brain around maths

    $ilver
    u have mentioned in a bracket know that is 4-(-3) that means multiplication so 4 (- * - in the bracket )3 is equal as 4 + 3 = 7
    when u just say 4-3 means that is 1 only
    In multiplication when the signs r same + symbol
    when opposite sign means - symbol
    now u may understood i think
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