Excel Column Summation

[Scott Adams]

I know this is likely an insanely simple situation, but it is early Tuesday
and I am stumped.

I have a simple spreadsheet breaking hours down by percentage to spread my
labor costs across multiple projects. All number cells are formatted the
same: Numeric with 1 decimal place. However, when I enter my total hours and
the math occurs, the resulting breakdown does not add back up to my total
hours. It is almost always off by 0.1

TOT 11.0
4% 0.4
15% 1.7
2% 0.2
31% 3.4
7% 0.8
17% 1.9
14% 1.5
5% 0.6
5% 0.6

Is there some contraint that I can place on any cell to force this to add up
correctly? I know it must be a decimal situation somewhere, but I am stumped.

THANK YOU!
Scott

 

[Stefi]

Instead of formatting try rounding to 1 decimal place: =ROUND(C1,1)
Regards,
Stefi


„Scott Adams†ezt írta:

 

[Jacob Skaria]

To overcome this you can use the ROUND() function on all your calculations, or
go to Tools>Options>Calculation>Precision as displayed..

If this post helps click Yes

 

[Scott Adams]

Thanks Stefi and Jacob --

I updated each function to round to 1 decimal as follows:

=ROUND(H2*$C$3,1)

The sum total still is high by 0.1

11.0
4% 0.4
15% 1.7
2% 0.2
31% 3.4
7% 0.8
17% 1.9
14% 1.5
5% 0.6
5% 0.6
11.1

 

[Jacob Skaria]

Scott add this manually and see...It adds upto 11.1

 

[Stefi]

I can't follow the calculation process, please post your original data set
and your formulae!
Stefi


„Scott Adams†ezt írta:

 

[David Biddulph]

Display your numbers as 2 decimal places (or as General) instead of 1, and
they will add up to 11.0.
It is because you rounded them to 1 place that you've got the wrong answer.

 

[Scott Adams]

Here are the formulae. Does this help?

Hrs/Day 11.0 <= C2
%
4% =Round(C2*percentage,1) 0.4
15% =Round(C2*percentage,1) 1.7
2% =Round(C2*percentage,1) 0.2
31% =Round(C2*percentage,1) 3.4
7% =Round(C2*percentage,1) 0.8
17% =Round(C2*percentage,1) 1.9
14% =Round(C2*percentage,1) 1.5
5% =Round(C2*percentage,1) 0.6
5% =Round(C2*percentage,1) 0.6
Total: 11.1

 

[Scott Adams]

Thanks! I knew it was something silly.

 

[David Biddulph]

As I mentioned in an earlier post, your rounding to one place is what causes
the numbers not to add up to 11.0.
Round them to 2 places, or don't bother rounding, and they'll add up to
11.0.
The values are
0.44
1.65
0.22
3.41
0.77
1.87
1.54
0.55
0.55

 

[David Biddulph]

You have replied to your own message and thanked yourself. If you were
trying to reply to someone else's message, you need to select that and reply
to it.

But I guess it's still early in the morning in your part of the world?