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Function SUM not working

  1. #1
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    Function SUM not working

    Hello,
    and sorry for my english.

    I have a little problem with function SUM (excel 2003).

    I have sum up five numbers:
    1. 0,0006
    2. -0,0008
    3. 0,0002
    4. 0,0000 or 0
    5. 0,0000 or 0

    ...and SUM of these numbers is -8,13152E-20

    What is wrong?

  2. #2
    Forum Expert oldchippy's Avatar
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    I'm no scientist or mathematician but it's something to do with this

    http://en.wikipedia.org/wiki/Scientific_notation
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  3. #3
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    Lightbulb

    Quote Originally Posted by ksz
    Hello,
    and sorry for my english.

    I have a little problem with function SUM (excel 2003).

    I have sum up five numbers:
    1. 0,0006
    2. -0,0008
    3. 0,0002
    4. 0,0000 or 0
    5. 0,0000 or 0

    ...and SUM of these numbers is -8,13152E-20

    What is wrong?
    Hi
    right click on cell which contains SUM formula, click Format Cell... and under categoty list select Number and increase decimal numbers as required.

  4. #4
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    but the problem is not in scientific notaion but with these:

    0,0006 + (-0,0008) + 0,0002 + 0 + 0 = 0 (zero) not -8,13152E-20

    and I don't have special formating cell (it must be set as AUTO)

  5. #5
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    Lightbulb

    Quote Originally Posted by ksz
    but the problem is not in scientific notaion but with these:

    0,0006 + (-0,0008) + 0,0002 + 0 + 0 = 0 (zero) not -8,13152E-20

    and I don't have special formating cell (it must be set as AUTO)
    do you want to show 0 (zero) at the begining of number.

  6. #6
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    Maybe I don't understand it

    Quote Originally Posted by starguy
    do you want to show 0 (zero) at the begining of number.
    but in these example I expected receive: 0, not -8,13152E-20 or -0,0000000000000000000813152


    When I set:
    0,02
    0,1
    0
    -0,02
    0
    the SUM is: 0,1

    When I set:
    0
    0
    0
    0
    0
    the SUM is: 0

    but when I set:
    0,0006
    -0,0008
    0,0002
    0
    0
    the SUM is: -8,13152E-20 (not 0). Why?

  7. #7
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    Quote Originally Posted by ksz
    Maybe I don't understand it



    but in these example I expected receive: 0, not -8,13152E-20 or -0,0000000000000000000813152


    When I set:
    0,02
    0,1
    0
    -0,02
    0
    the SUM is: 0,1

    When I set:
    0
    0
    0
    0
    0
    the SUM is: 0

    but when I set:
    0,0006
    -0,0008
    0,0002
    0
    0
    the SUM is: -8,13152E-20 (not 0). Why?
    the sum you show is bits 64 & 65 in binary counting from the decimal point. Chip Pearson explains counting problems at http://www.cpearson.com/Excel/rounding.htm

    the binary of the 3 numbers you have are
    0.0008 000000000011010001101101110001011101
    0.0002 000000000000110100011011011100010111
    0.0006 000000000010011101010010010101000110

    and I see no reason why it doe not resolve to zero except that the problem I think of as the 10c rule applies, that is the numbers (like .1) have no definitive value, but but keep 'recurring' in a pattern ever decreasing in value.
    Simply put, it's the same problem calculators had with one-third.

    Perhaps chip's explanation will give you a much better understanding.

    hth
    ---
    Last edited by Bryan Hessey; 03-24-2007 at 08:05 AM.
    Si fractum non sit, noli id reficere.

  8. #8
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    the sum you show is bits 64 & 65 in binary counting from the decimal point. Chip Pearson explains counting problems at http://www.cpearson.com/Excel/rounding.htm

    the binary of the 3 numbers you have are
    0.0008 000000000011010001101101110001011101
    0.0002 000000000000110100011011011100010111
    0.0006 000000000010011101010010010101000110
    Thanx for link. Maybe it is my problem.

    I don't know like the MS Excel's SUM function working, but in my example SUM these three walues: 0,0006, -0,0008 and 0,0002 is 0, but when I have add next cells with 0 the SUM going wrong. 0+0+0=0?

  9. #9
    Forum Moderator daddylonglegs's Avatar
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    As Bryan suggests, this is a known issue in Excel (and other applications). Here's what Microsoft says

    http://support.microsoft.com/kb/78113/en-us

    If you want your sum to resove to zero then, as suggested in the link, use ROUND, e.g.

    =ROUND(SUM(A1:A5),10)

    or similar

  10. #10
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    ...and it is the end.

    Thank You for help me.

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