File size changes when extract page saved

I receive PDF files with multiple pages that I have to separate.  I use Adobe Acrobat 7.  I open the large file, extract a page and delete it from the larger file, then save the single page with a different name.  I work my way through the large file until all pages are separated.  I have been doing this successfully for a long time.   Today, I received a 870kb file with 24 pages.  Usually the individual pages are around 50kb.  Today, each extracted file was around 300kb.  This made each of the 24 pages well over 10mb when the origial single file was only 870!  This just started happening suddenly.  I have made no changes to settings from the last time I extracted pages this way.   Can anyone help?  This is a huge mystery and needless to say, a huge handicap!  Thanks!

Thanks much for your reply.  It said that "images" was 55.61% and "X object forms" was 41.10%.  The rest were less than 2% each.  Other PDFs I work with are created by a designer the same way as the ones I had problems with.  For some reason, my Adobe is treating some of them differently when I extract pages.  A single file that was 870kb and 24 pages wound up being about 10mb-worth of 24 individual pages.   Any ideas?  Thanks again!
Kim

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    Why is this happening and how can I stop it?
    I'm using a lot of images for a print project so need to keep file sizes small with resolution of 300dpi. The image dimensions are really small, only about 30mm high so they shouldn't be this large a file size
    I am using a clipping path but this doesn't seem to be effecting file size (I checked by saving it as RGB with a clipping path which stayed small, and by saving one without a clipping path in CMYK which was huge)
    Thanks

    Two things may be happening: 
    1)      you may be making the file pixel dimensions (width and height) larger due to the 300 dpi requirement.
    2)      CMYK files, with 4 colors per pixel, are expected to be larger than JPG files, which are 3 colors per pixel and the data is compressed in a way that throws away information.
    You will not get CMYK files anywhere near as small as JPG files, as you are finding.   If there are compression options available when you save the file, perhaps those can make the files smaller.
    What pixel dimensions is the original JPG and what pixel dimensions are the CYMK files?

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