You might think about linking your excel files instead of copying and
pasting This may help there. Linking information from Excel
http://www.pptfaq.com/FAQ00593.htm
Or, you could also paste your page as an image file that way you could size
it to whatever size you wanted.

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Michael Koerner
MS MVP - PowerPoint
>I have created 11 plus files in excel and pasted them in to powerpoint with
> no problem. I have 2 more to add and when I copy and paste them just as I
> done the others they go way off the page and I cannot resize them. they
> are
> not large files. 25 rows and 10 columns.