How to resize all pages -Acrobat 9 Pro Extended ? ?

Question

I came across a pre-existing pdf file of an old book of genealogy.  According to the front pages, it was 'Digitized by Microsoft', so I know nothing on how it was generated.  Total pages are in excess of 1,100.
In viewing the pages, they are reflected as 2 pages to a view; not the book opened with the spine in the middle, but images side by side ... in numerical order ... and they appear as a normal sized 2 page for that view.  When I print out a page, by number, it also prints out in a normal size on an 8x11 inch sheet of paper.
However, rather than print page by page on individual sheets of paper, I want to print out multiple pages, 2 to a sheet of paper.  In doing this, the images of the pages come up as 3x5 inch; thus not readable if printed without the usage of magnifier.
Not that familiar with the program, but tried to do a resize process by setting some adjustments and then to a new pdf file.  It did not change that much ... and increased the file size dramatically.
I am a novice to these processes.  Can someone advise how to resize the whole file, with images of pages side by side, so that when multiple print is used for 2 pages the size comes up closer to something like 5x7 inch each?
Thanks

Answer 1

Let me try it this way.....
1.  The pdf file, when initially opened up, in the opening view shows 2 simotaneous pages side by side ... with hardly a divider between them.  This at this point has nothing to do with the print mode.
2.  The book in question was 'Digitized by Microsoft' ... don't know if that makes any difference, but thought it would help to under stand that it was not created by the normal Adobe Acrobat method.
3.  Now, when I go to the Print mode, from where I just viewed the 2-side-by-side pages, the initial view there, for 'page', is just 1 page ... not the 2 page view I just came from ... and it will print out this view in a full sheet version.
4.  But, not wanting to print out 1130 pages, want to print multi-page as allowed under Acrobat options.
5.  So choose multi-page and 2 pages and "Print to printable area"..
6.  When this option appears in the print viewing window, the 'images' (presuming that to be the correct reference) are small, over the normal (roughly) 5 x 7 inch (each) for a 2-page print option.
7.  With the 2-page print option, the images are only 3.5 x 5.25 inches ... rather than something like 5 x 7 inch ... which is difficult to read without a magnifier.  [Note:  This 3.5 x 5.25 is as indicated in Properties that the original 'Digitizing' did.
8.  So, in essence, how can one change the default individual image size from 3.5 x 5.25 inch size, to something closer to 5 x 7 inch size ... so that each image fills in more of it's half of the 8.5 x 11 inch page being printed ... rather than the small size reflected in the attached jpg ?
I've attached a jpg of the print screen, and one of the 2 page side-by-side 'default' view in Acrobat.
Thanks