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Math Help - Subtraction Basics

  1. #1
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    Subtraction Basics

    Hello people

    Im new to this forum, I hope Ive posted this in the correct section, I did search for help on my question before posting a new thread but didnt find speciffically what I was looking for.
    I am very poor at maths, and over the next few weeks I will be doing a basic Maths course aimed at improving basic maths skills for those with little or none, like myself.
    I am currently trying to learn some very basic things including Subtraction, Multiplication and Division. Today I am trying to learn how to subtract on paper. Borrowing and carrying over (I think thats what its called lol).
    Sometimes it works other times it does not.

    Heres a problem Ive given myself

    23002
    - 9439


    The answer is 13563, using calculator, but when I try to do it on paper I get 11637


    23002
    - 9439

    Basically borrow 1 each time from 3 (in 23002) to turn 2 (of 23002) into 12.
    I'm struggling to even explain this so Ive made a picture, bellow.
    Any help would be very much appreciated. If Ive over complicated it, Basically Id appreciate if you could tell me how to subtract that number (and others) on paper. Using borrowing numbers.
    Thank you very much

    Ross.

    IMAGE Bellow. Please click to see were Im going wrong. Thanks again.

    Subtraction Basics-subtraction.png
    Last edited by SNOOP123123; August 26th 2012 at 01:54 AM.
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  2. #2
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    Re: Subtraction Basics

    Quote Originally Posted by SNOOP123123 View Post
    Hello people

    Im new to this forum, I hope Ive posted this in the correct section, I did search for help on my question before posting a new thread but didnt find speciffically what I was looking for.
    I am very poor at maths, and over the next few weeks I will be doing a basic Maths course aimed at improving basic maths skills for those with little or none, like myself.
    I am currently trying to learn some very basic things including Subtraction, Multiplication and Division. Today I am trying to learn how to subtract on paper. Borrowing and carrying over (I think thats what its called lol).
    Sometimes it works other times it does not.

    Heres a problem Ive given myself

    23002
    - 9439


    The answer is 13563, using calculator, but when I try to do it on paper I get 11637


    23002
    - 9439

    Basically borrow 1 each time from 3 (in 23002) to turn 2 (of 23002) into 12.
    I'm struggling to even explain this so Ive made a picture, bellow.
    Any help would be very much appreciated. If Ive over complicated it, Basically Id appreciate if you could tell me how to subtract that number (and others) on paper. Using borrowing numbers.
    Thank you very much

    Ross.

    IMAGE Bellow. Please click to see were Im going wrong. Thanks again.

    Click image for larger version. 

Name:	Subtraction.png 
Views:	7 
Size:	27.4 KB 
ID:	24602
    The idea of "borrowing" means that you take something from one column and put it into the next one.

    In your case, you have 2 "ten thousands", 3 "thousands" and two "units", and you are subtracting 9 "thousands", 4 "hundreds", 3 "tens" and 9 "units".

    First of all, you can't subtract 9 units from 3 units, so you will need to borrow from somewhere else. The only place you can borrow from is from the 3 thousands.

    So take one of those thousands. This is the same as 10 hundreds. You will be left with 2 thousands.

    You can then borrow one of these hundreds, which is the same as 10 tens. You will be left with 9 hundreds.

    You can then borrow one of these tens, which is the same as 10 units. You will be left with 9 tens.


    So what you are now going to do is 2 "ten thousands", 2 "thousands", 9 "hundreds", 9 "tens" and 12 "units", subtracting 9 "thousands", 4 "hundreds", 3 "tens" and 9 "units."


    When you do the 12 units minus 9 units, you are left with 3 units.


    Now try to subtract the tens. You can do 9 tens minus 3 tens, leaving 6 tens.


    Now try to subtract the hundreds. You can do 9 hundreds minus 4 hundreds, leaving 5 hundreds.


    Now try to subtract the thousands. You CAN'T do 2 thousands minus 9 thousands, so you will need to borrow from the ten-thousands. See how you go...
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  3. #3
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    Re: Subtraction Basics

    Thank you very much for your fast response. Much appreciated.

    I'm off to spend some time, armed with the info you gave me to practice. This has been a great help to me, as I just couldnt work these things out with these vital bits of information.

    So yeah thanks again, I will likely be picking your brains again over the next few weeks whilst I do this course.

    Cheeers
    Ross.



    Yay - I got it, ah that feels better that I can do it now, that was anoyin me lol.


    Couldnt have done without your help
    Last edited by SNOOP123123; August 26th 2012 at 04:02 AM.
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  4. #4
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    Re: Subtraction Basics

    Try using google; some sites you would have been given:

    Google

    With subtractions, you can check your own work:
    113
    - 47
    -----
    66

    66 + 47 = 113 ; get my drift?
    Last edited by Wilmer; August 26th 2012 at 04:33 PM.
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  5. #5
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    Re: Subtraction Basics

    Hi,

    The question you posted is very simple to solve.Use the usual subtraction method :-
    23002
    - 9439
    answer will come 16563.
    However, for your help in math subject, you can visit 1to1Tutor.org. Its a very useful site which will provide you the basic knowledge for the subject.
    Online Math Tutor
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