Need help with formulas

[Eric]

I am trying to get sum in G9 using G3 x D3 + G5 x D5 + G7 x D7. Can somebody
help?

 

[Max]

I am trying to get sum in G9 using G3 x D3 + G5 x D5 + G7 x D7.

One of these options in G9 should do it:
1. Simplest: =SUM(G3*D3,G5*D5,G7*D7)
2. If intervening cells are blank: =SUMPRODUCT(D37,G3:G7)
3. If intervening cells need to be skipped:
=SUMPRODUCT(--(MOD(ROW(D37),2)=1)*D37*G3:G7)

 

[Max]

The 3rd option should read simply as:
=SUMPRODUCT((MOD(ROW(D37),2)=1)*D37*G3:G7)

(no need for the preceding: "--")

 

[Rick Rothstein \(MVP - VB\)]

Well, there is always this way...

=G3*D3+G5*D5+G7*D7

Rick

 

[Eric]

Thanks Max. I actually figured it out just before your reply came through; I
did it with the first option you listed.

I have a much harder one I am trying to figure out now. I have figured out
the formula to get the sum from 31 sheets on to a summary
sheet at the end of the Excel book; EX: =SUM(1:31!J3:J8). However, I now need
to know how to do it with an exception. Ex: I need =SUM(1:31!P38) BUT ONLY
IF THE FIGURES IN P38 ARE POSITIVE.
Then I need, for another cell, =SUM(1:31!P38) BUT ONLY IF FIGURES IN P38
ARE NEGATIVE.

 

[Max]

Eric,
Suggest you put in a fresh new posting for your new query